Papers by Dhananjay Thombare
IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE), 2021
In this research, an alpha Stirling engine having phase angle and air as a working fluid is inves... more In this research, an alpha Stirling engine having phase angle and air as a working fluid is investigated. Regenerator simulation is performed on various pressure ranges, mesh sizes, temperature ratios and engine speeds. The focus of research is kept on analysis of effect of regenerator length, wire mesh size, wire mesh arrangement, porosity of mesh and wire mesh material on regenerator effectiveness. The theoretical study is made for above parameters and simulated with software. Study concluded that increased regenerator length leads to decrease in pressure drop which results into reduction in break power of the engine. Pressure drop in oscillating flow is nearly doubles compare to pressure drop in steady one directional flow. Regenerator effectiveness increases with mesh size with expense of pressure drop. Engine speed play major role in convection heat transfer at regenerator wire mesh. Heat transfer at wire mesh is depends on flow velocity which should be moderate one, so that, maximum heat can be transfer by convection. Temperature ratio does not have significant effect on pressure drop in side the regenerator. Regenerator effectiveness is directly proportional to wire mesh size and inversely proportional to the temperature ratio.
International Journal of Innovative Studies in Sciences and Engineering Technology, 2021
A bio mass Stirling cycle engine system with all necessary components is designed for 1 kW power ... more A bio mass Stirling cycle engine system with all necessary components is designed for 1 kW power output. The designed engine is simulated for air standard cycle analysis for thermodynamic performance evaluation. The main objective of this paper is to study different charge pressures of working fluid and different temperature ratio to select best suitable pressure and temperature range for Bio-mass Stirling engine. In this paper a theoretical analysis of performance of engine on the basis of different charge pressures of working fluid is carried out. Around 1 to 10 bar pressure range of working fluid were selected and optimized for maximum power output. After analysis the engine cycle efficiencies attained in this simulation is from 66% to 25%.The working fluid charge pressure 10 bar and temperature ratio 0.25 has shown best engine thermal performance. The results obtained by the simulation will be useful in selection of initial charge pressure and temperature range for Stirling engine and will provide helpful guideline to design Stirling engine components.
International Conference on Mechanical and Electrical Technology, 3rd, (ICMET-London 2011), Volumes 1–3, 2011
CITATIONS 0 READS 43 1 author: Some of the authors of this publication are also working on these ... more CITATIONS 0 READS 43 1 author: Some of the authors of this publication are also working on these related projects: Ethanol and methanol HCCI engine developement View project Dhananjay Thombare Rajarambapu Institute Of Technology 16 PUBLICATIONS 159 CITATIONS SEE PROFILE All content following this page was uploaded by Dhananjay Thombare on 29 June 2015. The user has requested enhancement of the downloaded file. All in-text references underlined in blue are added to the original document and are linked to publications on ResearchGate, letting you access and read them immediately.
Simple structural surfaces (SSS) method of analysis is comparatively easy to understand. This tec... more Simple structural surfaces (SSS) method of analysis is comparatively easy to understand. This technique may be used as a preliminary step to carry out Finite Element Analysis. This method is particularly useful in assessing possible applied load paths. Finite element analysis (FEA) involves solution of engineering problems using computers. Finite element method provides a high level of accuracy for many types of load case and can even give a reasonable prediction of accident damage. Now a day's there are various computational solvers used for analysis. In this paper only review for element type used, constraint used, load and boundary conditions which used for static strength analysis of floor of passenger car that is pre-processing step in finite element method. This paper will help for how pre-processing is done in static stiffness analysis of the car body.
Heater of a Stirling engine is a hot gas heat exchanger used to transfer heat from flue gases of ... more Heater of a Stirling engine is a hot gas heat exchanger used to transfer heat from flue gases of biomass
combustion. The heat of biomass combustion is transferred to working fluid of engine which flows inside the
heater tubes. The performance and efficiency of an engine depends upon effectiveness of heat transfer to the
working fluid of the engine from hot combustion gases. To achieve best heater performance, it is necessary to
get maximum heat transfer with minimum flow losses. The performance of heater depends upon number of
heater tubes, tube diameter and length of the tubes. The heater tube configuration varies thermal and flow
performance of heater. In the present work, heaters for Stirling engine are designed for maximum performance.
Some selected heater geometries are simulated for heat transfer and pressure loss analysis. The heater geometry
with tube inside diameters 3 mm, 4 mm and 5 mm were simulated for performance. The CFD simulation shows
that, the heater with 4 mm inside diameter of tube has shown optimum thermal and pressure drop performance.
In this paper various methods for radiator performance evaluation and testing of the radiator are... more In this paper various methods for radiator performance evaluation and testing of the radiator are considered because all internal combustion engines produce heat as a byproduct of combustion and friction. This heat can reach temperatures up to 1925°C (3500°F) and can have catastrophic affects on engine components. Pistons, valves and cylinder heads must be cooled to reduce the risk of detonation. Cylinder temperatures need to be controlled so lubricating oil can maintain a protective film on the cylinder surfaces and the lubricating oil should be cooled to ensure its integrity. In addition to overheating, overcooling can have negative effects on the engine. Overcooling can reduce engine performance and shorten the engine’s service life. Cooling systems are used to manage engine heat. Cooling systems must be properly designed, operated and maintained for proper engine operation and service life [5].
In transforming students into competent engineer the role of engineering educators have become cr... more In transforming students into competent engineer the role of engineering educators have become crucial. Because of increased number of engineering institutes all over India all competent and incompetent students are getting admission to the institutes. The entry level merit of students also varies from student to student because of policies of state and central government. Because of this all graduating students are not acquiring desired skills and competencies and hence many of them could not get job in the industry. The present study focuses on identification of the personality factors of fresh engineering student which is required for successful completing the course. The personality factors such as verbal, non-verbal and general intelligence, numerical, spatial ability, form and clerical perception was assessed and students are guided to attain desired level of academic and personal attainments. The findings of the study show that the test and individual counseling has helped students to align the academic efforts towards a career path.
The increasingly worldwide problem regarding rapid economy development and a relative shortage of... more The increasingly worldwide problem regarding rapid economy development and a relative shortage of energy, the internal combustion engine exhaust waste heat and environmental pollution has been more emphasized heavily recently. Out of the total heat supplied to the engine in the form of fuel, approximately, 30 to 40% is converted into useful mechanical work; the remaining heat is expelled to the environment through exhaust gases and engine cooling systems, resulting in to entropy rise and serious environmental pollution, so it is required to utilized waste heat into useful work. The recovery and utilization of waste heat not only conserves fuel (fossil fuel) but also reduces the amount of waste heat and greenhouse gases damped to environment. The study shows the availability and possibility of waste heat from internal combustion engine, also describe loss of exhaust gas energy of an internal combustion engine. Possible methods to recover the waste heat from internal combustion engine and performance and emissions of the internal combustion engine. Waste heat recovery system is the best way to recover waste heat and saving the fuel.
Plain hydrodynamic journal bearings are essential component of various rotating machinery. Vibrat... more Plain hydrodynamic journal bearings are essential component of various rotating machinery. Vibrations associated with journal bearing have many aspects. Vibrations of journal bearing related with lubricant are important from stability, performance and operational point of view. Lubricant viscosity is one of the major parameter affecting the stability of plain hydrodynamic journal bearing. This experimental work attempts to correlate the lubricant viscosity and vibrations of the plain hydrodynamic journal bearing system. An experimental setup is designed to acquire data in the form of vibration signals in time and frequency domain. Various set of experiments are formed for different combinations of lubricant viscosity, shaft speed and load. Taguchi’s orthogonal array method is utilized for design of experiments. Analysis of data shows that lubricant viscosity has evident effect on vibrations of the system. Thinner oils show fewer vibrations at higher speeds, while thicker oils show less vibration at lower speeds. Thick oils contribute in reducing the overall RMS value of vibration amplitude
Journal bearings are widely used in rotating machinery to support shafts. Stability of system is ... more Journal bearings are widely used in rotating machinery to support shafts. Stability of system is very much important in such cases. Stability of system depends on number of parameters like operating speed, bearing dimensions, eccentricity, load etc. Dynamic coefficients can provide idea about stability behaviour of the system. This work attempts to correlate the viscosity of lubricant with dynamic coefficients. Values of eight dynamic coefficients are calculated for the proposed system considering five various SAE grade lubricating oils. These values are plotted against eccentricity. Dynamic coefficients changes almost linearly with change in viscosity of lubricating oil.
A shock absorber is a damping element of the vehicle suspension and its performance directly affe... more A shock absorber is a damping element of the vehicle suspension and its performance directly affects the ride ability. Nitrogen gas plays more important role in process of shock absorber damping. The process study of Gas filling operation shows that improper gas filling in to shock absorber; this is because of lack of proper fixture and alignment of gas charging system. This affects time required to complete the gas charging process which affect the overall production rate. It also results in undesirable sound effects in Suspension during working which affects on overall performance of Shock absorber. To reduce time required for gas filling and ensure proper gas filling process is atomised using Special Purpose Machine. So, Special Purpose machine is designed to carry out Gas filling in to shock absorber.
The purpose of this review paper is to study of effect of the different tire operating parameters... more The purpose of this review paper is to study of effect of the different tire operating parameters on tire performance and review of testing setup to test these tire performance parameters. The testing of tire performance parameters by experimentally is help to designer to correlate the relationships of parameters and to design the tire, hence it is need to testing of tire. Knowledge about dynamic properties of tires is an essential for any kind of research and development activities on vehicle dynamics. The main purpose of laboratory testing is to separate the properties of the tire from the vehicle, achieve high rate of reproducibility and to optimize the cost. This review paper gives the information regarding of different researcher's works on inter laboratory tire testing setup for measuring tire performance parameters and also this review paper helps to understand the factors on which tire performance parameters is depends.
During repair and maintenance work of three wheeler vehicle, the front fender is used to lift the... more During repair and maintenance work of three wheeler vehicle, the front fender is used to lift the vehicle. As this fender is not designed to take the load there is need to predict the structural strength of fender. In this paper, the stresses developed in the fender are analyzed by Finite Element Analysis and experimental methods.
The performance of Stirling engines meets the demands of the efficient use of energy and environm... more The performance of Stirling engines meets the demands of the efficient use of energy and environmental security and therefore they are the subject of much current interest. Hence, the development and investigation of Stirling engine have come to the attention of many scientific institutes and commercial companies. The Stirling engine is both practically and theoretically a significant device, its practical virtue is simple, reliable and safe which was recognized for a full century following its invention by Robert Stirling in 1816. The engine operates on a closed thermodynamic cycle, which is reversible. Today Stirling cycle-based systems are in commercial use as a heat pump, cryogenic refrigeration and air liquefaction. As a prime mover, Stirling cycles remain the subject of research and development efforts. The objective of this paper is to provide fundamental information and present a detailed review of the past efforts taken for the development of the Stirling cycle engine and techniques used for engine analysis. A number of attempts have been made by researches to build and improve the performance of Stirling engines. It is seen that for successful operation of engine system with good efficiency a careful design of heat exchangers, proper selection of drive mechanism and engine configuration is essential. The study indicates that a Stirling cycle engine working with relatively low temperature with air of helium as working fluid is potentially attractive engines of the future, especially solar-powered low-temperature differential Stirling engines with vertical, double acting, and gamma configuration. r
Journal of Renewable and Sustainable …, Jan 1, 2012
Performances on engine-out emissions and combustion of ethylene glycol monobutyl ether palm oil m... more Performances on engine-out emissions and combustion of ethylene glycol monobutyl ether palm oil monoester as a newtype biodiesel J. Renewable Sustainable Energy 4, 053118 Dynamical regimes due to technological change in a microeconomical model of production Chaos 22, 033149 Investigating and understanding fouling in a planar setup using ultrasonic methods Rev. Sci. Instrum. 83, 094904 Improvement of the oxidative stability of used-oil biodiesel by epoxidation reaction J. Renewable Sustainable Energy 4, 053108 Strength analysis and optimisation of double-toroidal anvils for high-pressure research Rev. Sci. Instrum. 83, 093902 (2012) Additional information on J. Renewable Sustainable Energy
SAE Technical …, Jan 1, 2010
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Papers by Dhananjay Thombare
combustion. The heat of biomass combustion is transferred to working fluid of engine which flows inside the
heater tubes. The performance and efficiency of an engine depends upon effectiveness of heat transfer to the
working fluid of the engine from hot combustion gases. To achieve best heater performance, it is necessary to
get maximum heat transfer with minimum flow losses. The performance of heater depends upon number of
heater tubes, tube diameter and length of the tubes. The heater tube configuration varies thermal and flow
performance of heater. In the present work, heaters for Stirling engine are designed for maximum performance.
Some selected heater geometries are simulated for heat transfer and pressure loss analysis. The heater geometry
with tube inside diameters 3 mm, 4 mm and 5 mm were simulated for performance. The CFD simulation shows
that, the heater with 4 mm inside diameter of tube has shown optimum thermal and pressure drop performance.
combustion. The heat of biomass combustion is transferred to working fluid of engine which flows inside the
heater tubes. The performance and efficiency of an engine depends upon effectiveness of heat transfer to the
working fluid of the engine from hot combustion gases. To achieve best heater performance, it is necessary to
get maximum heat transfer with minimum flow losses. The performance of heater depends upon number of
heater tubes, tube diameter and length of the tubes. The heater tube configuration varies thermal and flow
performance of heater. In the present work, heaters for Stirling engine are designed for maximum performance.
Some selected heater geometries are simulated for heat transfer and pressure loss analysis. The heater geometry
with tube inside diameters 3 mm, 4 mm and 5 mm were simulated for performance. The CFD simulation shows
that, the heater with 4 mm inside diameter of tube has shown optimum thermal and pressure drop performance.