Experimental study of mechanical losses of single-cylinder spark-ignited engine

Romero, Carlos; Henao, Edison; Ramírez, Juan David

doi:10.29354/diag/141226

Cited by 4 publications

(2 citation statements)

References 21 publications

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“…In [7], the total mechanical losses, pump losses, the sum of friction forces, the mechanical efficiency of a single-cylin-der engine with spark ignition Robin EY15 at different rotational speeds and loads are determined and analyzed by the method of indicating working process. In addition, the experimental results were compared with the results calculated using some of the dependences available in the literature.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determining the power of mechanical losses in a rotary-piston engine

Mytrofanov

Proskurin

Poznanskyi

et al. 2022

EEJET

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This paper reports an experimental study into the magnitude of the power of mechanical losses of the prototype of a rotary-piston engine with an articulated cam mechanism for transforming movement, which was aimed at resolving the issue related to improving the efficiency of energy conversion. It has been experimentally established that the greatest component of the power of mechanical losses in a rotary-piston engine with an articulated cam motion transformation mechanism is friction losses. Depending on the rotational speed, they are about 68.4...74.4 % of total losses. The influence of the rotor rotation frequency on the total change in the power of mechanical losses and its components has been determined (an increase in the rotations by 3.75 times leads to an increase in the power of mechanical losses by 3.3 times). It is established that the rotation frequency of the rotor does not have the same effect on the power components of mechanical losses. Thus, an increase in the rotations by 3.75 times leads to an increase in friction losses by 3.0 times, and the component of losses on pumping strokes by 4.1 times. It was found that an increase in the pressure of working body by 2.0 times contributes to an increase in the mechanical efficiency of the rotary piston engine by 1.1 times. At the same time, it was determined that the rational speed range, which corresponds to the maximum values of the mechanical coefficient of efficiency, regardless of the pressure of working medium, is 800...1200 min–1. The resulting experimental data on studying the magnitude of the power of mechanical losses in the form of an analytical model of the influence of the main operational parameters of the rotary-piston engine with an articulated-cam mechanism for converting movement into a mechanical coefficient of efficiency have been generalized. The results reported here could make it possible to preliminary assess losses at energy conversion at the design stage and to construct a rotary piston engine for different purposes

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determining the power of mechanical losses in a rotary-piston engine

Mytrofanov

Proskurin

Poznanskyi

et al. 2022

EEJET

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“…Related to mechanical losses, these are composed by the rubbing friction of all the moving pairs, the pumping work due to the intake and exhaust process backpressure and the power needed to drive the auxiliary systems [16][17][18][19][20][21]. Only the friction losses consume 4−15 % of the energy provided by the fuel [8], i.e., that by reducing the mechanical loss is possible to improve the net engine efficiency.…”

Section: Introductionmentioning

confidence: 99%

Test bench development and implementation for experimental determination of mechanical losses in single cylinder internal combustion engines

Romero Piedrahita,

Monroy Jaramillo,

Ramírez Alzate

2023

Eureka: PE

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As mechanical efficiency has great relevance in the alternative engine performance, the authors research in the development of testing facilities to characterize the sources of engine mechanical losses. The present paper deals with the realization of a hardware platform to conduct experimental studies in small combustion engines to experimentally characterize the mechanical losses of a single-cylinder internal combustion engine by means of the indicated diagram and motoring methods. The system was completed by means of an electrical motor-generator coupled to a single-cylinder air-cooled spark ignition engine, a self-developed electronic hardware control, and a PC-based instrumentation and data acquisition system. Specifications of load-motoring-starting system, including the description of the proprietary electronic load regulation system, are detailed. Also, the instrumentation system of in-cylinder and intake pressures; Temperatures of intake air, exhaust gases, lubricant oil, and engine block; effective torque and crankshaft position are described, including the signal acquisition system. The methodologies for indicated diagram and motoring method are described, mentioning the required measurements to apply each method and the engine load-temperature considerations when an engine is tested in fired or motored conditions. The platform was used to study the mechanical losses of the engine under motored and fired conditions under a wide range of rotational speeds and throttle openings, allowing to draw conclusions about the operating features of the developed test bench in itself, and also about the mechanical losses of the engine tested. Initially, samples of cylinder pressure, torque, intake pressure as function of crank angle and indicate diagram were obtained, showing similar waveforms present in related literature. Then, variations of the aforementioned temperatures against rotation speed and throttle opening and results for the mechanical losses determined by indicated diagram and motoring methods are shown. Finally, two empirical correlations are proposed to estimate the mechanical losses. In the future the hardware platform will be utilized to investigate in-cylinder engine parameters, detailed thermal and mechanical engine performance

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Experimental Characterization of the Mechanical Loss Components of a Single-Cylinder Spark-Ignition Engine by Progressive Disassembly Method

Romero¹,

Ramírez²,

Castañeda³

2023

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">In this work, the progressive disassembly method is used to determine the mechanical losses contributed by the different components of a single-cylinder spark ignition engine tested at crankshaft angular speeds of 300−1900 min<sup>-1</sup>, and lubricant temperatures between 30−35 °C. From the experimental measurements, the losses due to the intake and exhaust manifolds, cylinder head, valve train, camshaft bearings, connecting rod-piston assembly, flywheel, and crankshaft bearings are determined. It is obtained that the elements with the highest contribution are the piston-connecting rod assembly and the cylinder head with contributions of 19.2−36.9% and 27−33.3%, respectively. Additionally, the indicated diagram method is applied to assess the pumping, heat, and blow-by losses of the complete motored engine during the intake and exhaust processes. Pumping losses, heat and blow-by transfers, friction, and auxiliary losses are characterized, obtaining contributions between 5.8−14.7%, 14.8−37.9%, 46.4−64.6%, and 5.8−9.9% for each group of component losses, respectively.</div></div>

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Experimental study of mechanical losses of single-cylinder spark-ignited engine

Cited by 4 publications

References 21 publications

Determining the power of mechanical losses in a rotary-piston engine

Determining the power of mechanical losses in a rotary-piston engine

Test bench development and implementation for experimental determination of mechanical losses in single cylinder internal combustion engines

Experimental Characterization of the Mechanical Loss Components of a Single-Cylinder Spark-Ignition Engine by Progressive Disassembly Method

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