Numerical simulation on the combustion and NOx emission characteristics of a turbocharged opposed rotary piston engine fuelled with hydrogen under wide open throttle conditions

Gao, Jianbing; Xing, Shikai; Tian, Gui Yun; Ma, Chaochen; Zhao, Meng; Jenner, Phil

doi:10.1016/j.fuel.2020.119210

Cited by 60 publications

(8 citation statements)

References 70 publications

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“…According to the calculation model of leakage from equations ( 14) to (17), MATLAB is used for numerical solution to obtain the pressure change process of the middle chamber, as shown in Figure 10.…”

Section: Calculate Results and Analysismentioning

confidence: 99%

“…By combining the state description models of chamber 1, chamber 2, and chamber 3 in equations ( 12) to (17), the gas leakage through the opening gap 1 and opening gap 2 can be obtained during the operation of the annular power cylinder.…”

Section: Leakage Model Of Chambermentioning

confidence: 99%

“…12,16 Gao et al studied the combustion and emission characteristics of a turbocharged ORP engine fueled with hydrogen were investigated to evaluate the overall performance of this engine. 12,17,18 Serrano et al proposed an opposed piston 2-stroke engine architecture based on rod-less innovative kinematics. 19 Grabowskiy conducted the zero-dimensional model of the scavenging process in the opposed-piston two-stroke aircraft diesel engine.…”

Section: Introductionmentioning

confidence: 99%

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Research on sealing characteristics of annular power cylinder based on twin-rotor piston engine

Pan

Liu

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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The sealing characteristics of an annular power cylinder based on the Twin-rotor piston engine are studied, which provides a theoretical foundation for the sealing design of a new high-power density piston engine. In this paper, the basis thermodynamic realization process of an annular power cylinder is presented. The Runge Kutta equation is used to establish the coupled leakage model of adjacent working chambers under annular piston seal. And the sealing performance of the annular power cylinder is analyzed in detail. Moreover, the influence of rotor speed and compression ratio on the sealing characteristics and leakage is studied. Finally, some tests are carried out to verify the sealing principle and simulation results, which verifies the theoretical basis of simulation analysis. Results show that there are double pressure peaks in the leakage chamber between two working chambers, which is beneficial to reduce the leakage rate. Besides, increasing the speed and decreasing the compression ratio can help to reduce gas leakage. Furthermore, the effects of speed variation on the leakage are only significant when rotating at low speed. Changing the compression ratio has a greater effect on the slope of the leakage curve at a low compression ratio, and the lower the compression ratio, the better the sealing effect.

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Section: Calculate Results and Analysismentioning

confidence: 99%

Section: Leakage Model Of Chambermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Research on sealing characteristics of annular power cylinder based on twin-rotor piston engine

Pan

Liu

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…When a turbocharger was applied to the hydrogen ORP engine, the power density was increased to approximately 104 kW/L, and the volumetric efficiency was higher than 89.5% even for the engine speed of 5000 RPM [45]; however, NO x emission factors reached 14 g/(kW•h) over low engine speeds [45]. Equivalence ratios of 0.7~0.8 could significantly drop NO x emission factors, with a minor penalty of indicated thermal efficiency [46].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Ignition Timing on the Emission and Combustion Characteristics for a Hydrogen-Fuelled ORP Engine at Lean-Burn Conditions

et al. 2022

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The application of hydrogen fuel in ORP engines makes the engine power density much higher than that of a reciprocating engine. This paper investigated the impacts of combustion characteristics, energy loss, and NOx emissions of a hydrogen-fuelled ORP engine by ignition timing over various equivalence ratios using a simulation approach based on FLUENT code without considering experiments. The simulations were conducted under the equivalence ratio of 0.5~0.9 and ignition timing of −20.8~8.3 °CA before top dead centre (TDC). The engine was operated under 1000 RPM and wide-open throttle condition which was around the maximum engine torque. The results indicated that significant early ignition of the ORP engine restrained the flame development in combustion chambers due to the special relative positions of ignition systems to combustion chambers. In-cylinder pressure evolutions were insensitive to early ignition. The start of combustion was the earliest over the ignition timing of −17.3 °CA for individual equivalence ratios; the correlations of the combustion durations and equivalence ratios were dependent on the ignition timing. Combustion durations were less sensitive to equivalence ratios in the ignition timing range of −14.2~−11.1 °CA before TDC. The minimum and maximum heat release rates were 15 J·(°CA)−1 and 22 J·(°CA)−1 over the equivalence ratios of 0.5 and 0.9, respectively. Indicated thermal efficiency was higher than 41% for early ignition scenarios, and it was significantly affected by late ignition. Energy loss by cylinder walls and exhaust was in the range of 10%~16% and 42%~58% of the total fuel energy, respectively. The impacts of equivalence ratios on NOx emission factors were affected by ignition timing.

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“…Combustion and NO x emission characteristics of an ORP engine fuelled with hydrogen at wide open throttle and stoichiometric conditions were investigated [35] that lower engine speed led to higher NO x emission factors. In order to compensate the power loss caused by low energy density of gaseous hydrogen by volume, the engine performance over turbocharged conditions was further analyzed [36]. Power density of this engine increased up to 104 kW/L; however, the NO x emission factors reached up to approximately 14 g• (kW• h) -1 .…”

Section: Introductionmentioning

confidence: 99%

Lean-burn characteristics of a turbocharged opposed rotary piston engine fuelled with hydrogen at low engine speed conditions

Gao

Tian

et al. 2021

International Journal of Hydrogen Energy

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Numerical simulation on the combustion and NOx emission characteristics of a turbocharged opposed rotary piston engine fuelled with hydrogen under wide open throttle conditions

Cited by 60 publications

References 70 publications

Research on sealing characteristics of annular power cylinder based on twin-rotor piston engine

Research on sealing characteristics of annular power cylinder based on twin-rotor piston engine

The Effect of Ignition Timing on the Emission and Combustion Characteristics for a Hydrogen-Fuelled ORP Engine at Lean-Burn Conditions

Lean-burn characteristics of a turbocharged opposed rotary piston engine fuelled with hydrogen at low engine speed conditions

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