A quasi-theoretical predictive 0D combustion model for 1D gasoline engine simulation

Nomura, Yoshihiro; Yamamoto, Seiji; Nagaoka, Makoto; Diel, Stephan; Kurihara, K.; Shimizu, Rio; Murase, Eiji

doi:10.1007/978-3-658-16988-6_70

Cited by 2 publications

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“…For PCCI combustion, the multistep shell model 12 is applied to simulate the ignition until the gas temperature exceeds 1000 K. Above 1000 K, simplified laminar–turbulence characteristic time combustion (LTCTC) 14 model is used. For SI combustion, the combustion period depending on the average temperature, pressure and equivalence ratio is estimated in advance, using in-house software, UniDES-G. 13 For both combustion strategies, heat loss is calculated by Woschni model. 15 The combustion period is taken based on the values of the previous cycle.…”

Section: Simulation For Key Design Parameters and Behaviors Of Fpegmentioning

confidence: 99%

Development of free piston engine linear generator system and a resonant pendulum type control method

Kosaka

Akita

Goto

et al. 2020

International Journal of Engine Research

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A free piston engine linear generator, which has the potential of the compact physique, high brake efficiency and high flexibility for fuel, has been developed. The developed free piston engine linear generator consists of a two-stroke combustion unit, an air-bounce chamber and a linear generator. The key technologies to realize the continuous operation are the control method and lubricating and cooling strategies. The proposed structure is featured as a piston shape with two different diameters coaxially, called a “W-shape” piston, which has an empty space inside for the oil cooling path. The performance of the structure is evaluated by a one-dimensional cycle simulation. The result indicates the possible output power of 10 kW and thermal efficiency of 42% using premixed charge compression ignition combustion strategy. The control method is another challenge of the free piston engine linear generator. This work proposes two strategies of the position feedback control method and the resonant pendulum type control method. The first method has the function of the feedback loops for the piston position and velocity so that the piston motion follows the reference profile calculated in advance. The experimental results show the limited range of operation because the fixed profile does not absorb the deviation of the piston motion due to the combustion deviation. The second method is based on the speed control without a fixed reference profile of the piston motion. The experimental result shows the robustness to the change in operating parameters such as ignition position, amount of fuel and desired power output.

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Section: Simulation For Key Design Parameters and Behaviors Of Fpegmentioning

confidence: 99%

Development of free piston engine linear generator system and a resonant pendulum type control method

Kosaka

Akita

Goto

et al. 2020

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…Bozza et al 16 ), as shown in equation (13). However, this requires modeling of the local laminar burning velocity, that is, extending equation (6) to general turbulent conditions and the turbulent Karlovitz number. Therefore, the fractal model was not verified.…”

Section: St Slmentioning

confidence: 99%

“…To resolve this issue, a sophisticated physical model-based development process (the so-called v-process shown in Figure 1) is required. In response, gasoline combustion models [1][2][3] have been constructed for three-dimensional (3D) computational fluid dynamics (CFD), and a methodology called UniDES-D/G (Universal DESign Engine Simulator-Diesel/Gasoline) [4][5][6] has been developed (Figure 2) for one-dimensional (1D) CFD. UniDES-G is a promising means of predicting engine performance using 3D CFD-based turbulence histories and universal highly accurate combustion models.…”

Section: Introductionmentioning

confidence: 99%

A predictive combustion model for one-dimensional gasoline engine simulation

Nomura

Yamamoto

Nagaoka

et al. 2020

International Journal of Engine Research

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A new predictive combustion model for a one-dimensional computational fluid dynamics tool in the multibody dynamics processes of gasoline engines was developed and validated. The model consists of (1) a turbulent burning velocity model featuring a flame radius–based transitional function, steady burning velocity that considers local quenching using the Karlovitz number and laminarization by turbulent Reynolds number, as well as turbulent flame thickness and its quenching model near the liner wall, and (2) a knock model featuring auto-ignition by the Livengood–Wu integration and ignition delay time obtained using a full-kinetic model. The proposed model and previous models were verified under a wide range of operating conditions using engines with widely different specifications. Good agreement was only obtained for combustion characteristics by the proposed model without requiring individual calibration of model constants. The model was also evaluated for utilization after prototyping. Improved accuracy, especially of ignition timing, was obtained after further calibration using a small amount of engine data. It was confirmed that the proposed model is highly accurate at the early stage of the engine development process, and is also applicable for engine calibration models that require higher accuracy.

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A quasi-theoretical predictive 0D combustion model for 1D gasoline engine simulation

Cited by 2 publications

References 0 publications

Development of free piston engine linear generator system and a resonant pendulum type control method

Development of free piston engine linear generator system and a resonant pendulum type control method

A predictive combustion model for one-dimensional gasoline engine simulation

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