Preliminary explorations of the performance of a novel small scale opposed rotary piston engine

Gao, Jianbing; Tian, Gui Yun; Jenner, Phil; Burgess, Max; Emhardt, Simon

doi:10.1016/j.energy.2019.116402

Cited by 41 publications

(31 citation statements)

References 47 publications

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“…The basic parameters of the ORP engines are shown in Table 1, they are also listed in the authors' previous work (Gao et al, 2019). This novel engine is a four cylinders, four stroke, naturally aspirated spark ignition engine, with 3 intake ports, 1 exhaust port, and 2 spark plugs.…”

Section: Structures and Operation Process Of Opposed Rotary Piston Enmentioning

confidence: 99%

“…The durations (in time series) of the intake and exhaust process in ORP engines are much shorter than conventional reciprocating engines, which may lead to a high pumping loss despite the effective surface area of the intake and exhaust ports are huge. As shown in the work (Gao et al, 2019), the layout of three intake ports and a big exhaust port is adopted to increase the charging efficiency. Gao et al explored the performance of a ORP engine over various engine speeds, using 1D and 3D simulation approaches (Gao et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…As shown in the work (Gao et al, 2019), the layout of three intake ports and a big exhaust port is adopted to increase the charging efficiency. Gao et al explored the performance of a ORP engine over various engine speeds, using 1D and 3D simulation approaches (Gao et al, 2019). In that work, the merits of the ORP engine were analyzed based on P-V diagrams, such that it is with a high power density, smooth rotation, a low noisy level, and free of crank connecting rod system.…”

Section: Introductionmentioning

confidence: 99%

“…The power density reaches 80 kW/L, which is almost twice of a conventional reciprocating engine with a same displacement. In the ORP engine (Gao et al, 2019), the exhaust port closes slightly before top dead center (TDC), and intake ports open slightly after TDC, which causes more pumping loss in intake and exhaust strokes. The work conducted by Gao et al is mainly focused on the evaluation of the overall performance and comparison with a conventional reciprocating piston engine (Gao et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…In the ORP engine (Gao et al, 2019), the exhaust port closes slightly before top dead center (TDC), and intake ports open slightly after TDC, which causes more pumping loss in intake and exhaust strokes. The work conducted by Gao et al is mainly focused on the evaluation of the overall performance and comparison with a conventional reciprocating piston engine (Gao et al, 2019). However, the intake characteristics and pumping loss are neglected although they are different from conventional reciprocating engines.…”

Section: Introductionmentioning

confidence: 99%

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Intake characteristics and pumping loss in the intake stroke of a novel small scale opposed rotary piston engine

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Journal of Cleaner Production

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Section: Structures and Operation Process Of Opposed Rotary Piston Enmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Intake characteristics and pumping loss in the intake stroke of a novel small scale opposed rotary piston engine

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A multilevel multiobjective coordination matching design technique for the main bearing assembly structure of a diesel engine

Zhao,

Shi,

et al. 2023

Energy Science & Engineering

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The main bearing assembly structure is one of the most important main load‐bearing structures of a diesel engine. The working loads of this structure increases dramatically with the increase of the power density of diesel engines, resulting in the problem of unsatisfactory reliability coordination design in restricted design space, while the mechanisms for coordinated design are still at the blank stage. Aiming at the problem, a multilevel multiobjective coordination matching design technique is innovatively proposed in this paper. This technique is characterized by a multilevel multiobjective coordination evaluation system for the assembly structure and its components based on the improved analytic hierarchy process. The finite element model and mathematical model of the main bearing assembly structure are established to realize the joint of finite element technology and optimization technology for coordination matching design. By carrying out verification experiments, the strength coordination, deformation coordination and contact strength coordination of the assembly structure increase by 13.91%, 14.96%, and 2.63%, respectively, after matching design, while the mass coordination remains almost constant meeting the lightweight design requirements. The overall coordination of the main bearing assembly structure is improved by 11.10%, achieving the goal of matching design of the main bearing assembly structure. The results show that the coordination evaluation system can quantitatively characterize the coordination relationship of the assembly structure and the multi‐reliability of components, and it is a feasible coordination evaluation method. The demonstrated coordination evaluation system and coordination matching design modeling approach provide important theoretical guidance for the matching design of complex assembly structures.

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A response coordination design technology for the main loaded structures of the internal combustion engines based on NSEHO

Zhao,

Shi,

Liu

et al. 2023

Energy Science & Engineering

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Response coordination design becomes an inevitable trend based on the multidisciplinary optimization design (MOD) in the development of the design for complex mechanical structures. Aiming at the problem of unclear mechanism of response coordination for main loaded structures, a response coordination design technology characterized by a response coordination evaluation system is proposed based on an analytic hierarchy process. In addition, a nondominated sorting elephant herding optimization (NSEHO) algorithm is proposed by introducing the Pareto optimization theory into elephant herding optimization and combining fixed‐sized candidate set adaptive random testing algorithm to overcome inherent limitations of the traditional algorithm in response coordination design. Taking the main bearing assembly structure as an example, the response coordination design is conducted based on the proposed technology and NSEHO algorithm. The response coordination design scheme of the main bearing assembly structure is experimentally verified. The results show that the Pareto frontier of NSEHO is smoother and is closer to the real Pareto frontier compared to NSGA‐II in condition of small population size and restricted iteration generations, revealing the advancement of the solving ability of NSEHO. The coordination coefficients of strength, stiffness, contact strength, and mass of the main bearing assembly structure are increased by 13.91%, 14.96%, 2.63%, and 0.07%, respectively, and the overall coordination coefficient are increased by 11.10%. The indicators of strength, stiffness, and contact strength of the response coordination scheme are better than those of the original scheme by experimental verification, demonstrating the effectiveness of the response coordination design technology. The proposed technology reveals the response coordination mechanism of the main loaded structures of internal combustion engines and provides an important guiding significance to MOD for complex mechanical structures.

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Preliminary explorations of the performance of a novel small scale opposed rotary piston engine

Cited by 41 publications

References 47 publications

Intake characteristics and pumping loss in the intake stroke of a novel small scale opposed rotary piston engine

Intake characteristics and pumping loss in the intake stroke of a novel small scale opposed rotary piston engine

A multilevel multiobjective coordination matching design technique for the main bearing assembly structure of a diesel engine

A response coordination design technology for the main loaded structures of the internal combustion engines based on NSEHO

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