Development of a Dynamometer for Measuring Small Internal-Combustion Engine Performance

Menon, Shyam; Moulton, Nathan; Cadou, Christopher P.

doi:10.2514/1.19825

Cited by 31 publications

(5 citation statements)

References 8 publications

(12 reference statements)

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“…The engine has the following speci cations: a bore of 87.5 mm diameter, a speed of 1500 rpm, a stroke of 110 mm, a rated power of 3.5 KW. During the experiments, the dynamometer affected the engine's speed and torque Menon et al [31]. Furthermore, the water-cooling system, which powers electronic equipment like gas analyzers and smoke alarms, was linked to the energy generated by the eddy current dynamometer.…”

Section: Resultsmentioning

confidence: 99%

Experimental study on the performance and emission properties of variable compression ratio engine at different compression ratios

Venkataramana,

Subhanjaneyulu,

Raghava

et al. 2024

Preprint

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This study experiments on a single-cylinder, four-stroke, variable compression ratio diesel engine by comparing the performance and emission properties of diesel and linseed biodiesel blends. The biodiesel blends were obtained using a volume basis of 10%,20%,30%, and 40% of the linseed biodiesel blends, respectively, for experimentation. The linseed biodiesel blends are compared to identify the optimum biodiesel blend under changing compression ratios from 13.5:1 to 16.5:1 with a speed of 1500 rpm. The outcomes show that a combination of 20% linseed biodiesel with 80% diesel gives maximum performance compared to all other blends. The blends exhibited increased mechanical efficiency and brake power. Blends LD10 to LD40 demonstrated 2.6% more excellent mechanical efficiency and 13.4% higher brake power than diesel at a 16.5:1 compression ratio. For the blends LD10 to LD40, the exhaust gas temperature was 54.7℃ lower than diesel. In addition, hydrocarbon and carbon monoxide emissions were reduced by 47% in the maximum blend percentage, and compared to diesel emissions, carbon dioxide emissions were 38.3% greater.

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Section: Resultsmentioning

confidence: 99%

Experimental study on the performance and emission properties of variable compression ratio engine at different compression ratios

Venkataramana,

Subhanjaneyulu,

Raghava

et al. 2024

Preprint

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show abstract

“…ICE test benches usually integrate the load and/or motoring system, which is mechanically coupled to the tested engine. Load systems may use different technologies, including friction braking systems, hydraulic systems, electric motor-generator drive [3] and electromagnetic [1,[4][5][6]. On the other hand, as motoring systems, direct current or alternating current electric motors are usually used [7].…”

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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“…[7][8][9][10][11][12] However, scaled-down reciprocating internal combustion (IC) engines should be attracting more attention. [13][14][15][16] To enable the development of scaling laws for small engine performance, Menon et al 17 constructed a dynamometer system suitable for measuring the performance of small IC engines and presented detailed performance measurements for a particular engine with a mass of 150 g. Rowton et al 18 analyzed and created scaling relationships for performance and efficiency among the scaling study IC engines, deduced that when the ratio of cylinder surface area to swept volume is less than 1.5 cm 21 , the cylinder wall heat loss is the main mechanism of thermal efficiency loss, and the performance of the scaled-down IC engine will be significantly affected. Sher and colleagues 19,20 developed a phenomenological model to consider the relevant processes inside the cylinder of a homogeneous-charge compression-ignition (HCCI) engine, proposed an approximated analytical solution to yield the lower possible limits of scaling down HCCI cycle engines, and indicated the minimum allowed engine size is between 0.3 and 0.4 cc (bore diameter 37.5 mm) and the maximum obstacle of scaling down the engines is gas leakage of blow-by.…”

Section: Introductionmentioning

confidence: 99%

Experimental test and thermodynamic analysis on scaling-down limitations of a reciprocating internal combustion engine

et al. 2020

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Due to the enormous energy densities of liquid hydrocarbon fuels for future utilization on micro scale, there is a concern about the feasibility of scaling down reciprocating internal combustion engines from small scale to meso scale. By building a specialized test bench, the performance and combustion characteristics of a miniature internal combustion engine with a displacement of 0.99 cc were tested, and the thermodynamic simulation was carried out to achieve a more complete understanding of in-cylinder mass and energy change of the miniature internal combustion engine. The miniature internal combustion engine had higher brake-specific fuel consumption, lower thermal efficiency, lower brake mean effective pressure, and serious cyclic variation; however, friction mean effective pressure seems to be less sensitive to engine speed. Simulation results showed that the miniature internal combustion engine had a poor volumetric efficiency, which was not more than 50%. The step-by-step processes of scaling down the miniature internal combustion engine were also simulated; it was found that the maximum indicated mean effective pressure loss was due to the imperfection of gas exchange processes, and the next was the imperfection of combustion. It is considered that for the scaled-down miniature internal combustion engines, more attention should be pay on improving the processes of gas exchange and combustion, and achieving meso-scale internal combustion engines with cylinder bore less than 1 mm is thermodynamically possible in future if these imperfections, especially that of the gas exchange process, can be effectively perfected.

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Development of a Dynamometer for Measuring Small Internal-Combustion Engine Performance

Cited by 31 publications

References 8 publications

Experimental study on the performance and emission properties of variable compression ratio engine at different compression ratios

Experimental study on the performance and emission properties of variable compression ratio engine at different compression ratios

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

Experimental test and thermodynamic analysis on scaling-down limitations of a reciprocating internal combustion engine

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