Study on the synthetic scavenging model validation method of opposed-piston two-stroke diesel engine

Liu, Yuhang; Zhang, Fujun; Zhao, Zhenfeng; Dong, Yongxiang; Ma, Fukang; Zhang, Shuanlu

doi:10.1016/j.applthermaleng.2016.03.094

Cited by 26 publications

(5 citation statements)

References 26 publications

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“…For a two-stroke engine, the volumetric efficiency can also be written as the scavenging efficiency η s , which is the function of delivery ratio l 0 ( n , p s ) . 31,33,34 Figure 5 shows the volumetric efficiency of the HIRTH-3203 engine obtained from equation (31).…”

Section: General Model Adjustment and Validationmentioning

confidence: 99%

Modeling of two-stroke aviation piston engines for control applications

Jiang

Zhou

et al. 2023

Advances in Mechanical Engineering

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Two-stroke Aviation Piston Engines are multivariable systems with severe non-linear dynamics, making their modeling challenging for control engineers. Although many studies have been conducted on simplified modeling of four-stroke gasoline engines and large-scale two-stroke diesel engines for automobiles and ships, only a few have focused on the general modeling of small two-stroke aviation engines. Thus, extensive research on a general modeling method for two-stroke aviation engines is required. A general non-linear Mean Value Engine Model (MVEM) of two-stroke aviation piston engines is developed. Various parts of the model are represented by appropriate empirical equations that require little engine data and easily fit different engines. The objective is to develop a general and accurate method for rapid engine modeling that captures the main dynamics and can create control systems for two-stroke aviation piston engines. The model is validated using HIRTH-3203 and NU-57 measurement data, and the results show that the issues of fitting simplicity and general applicability are well addressed. Finally, the air-fuel ratio control based on the model predictive control method is carried out on the HIRTH-3203 MVEM, which demonstrates the effectiveness of the proposed MVEM in the controller design and evaluation. The proposed model may support the application of new control technologies, such as adaptive control and intelligent control, in the two-stroke aviation piston engine systems.

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Section: General Model Adjustment and Validationmentioning

confidence: 99%

Modeling of two-stroke aviation piston engines for control applications

Jiang

Zhou

et al. 2023

Advances in Mechanical Engineering

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“…When the residual gas ratio (γ) in both applied and inherent conditions is determined, the In-EGR and Ex-EGR rates can be estimated as follows [49][50][51][52][53]:…”

Section: Of 16mentioning

confidence: 99%

Combustion and Emission Enhancement of a Spark Ignition Two-Stroke Cycle Engine Utilizing Internal and External Exhaust Gas Recirculation Approach at Low-Load Operation

et al. 2019

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Two-stroke cycle engines have always been prominent due to their distinctive advantage incorporating high power-to-weight ratio, however the drawbacks are poor combustion efficiency, fuel short-circuiting and excessive emission of uHC and CO. These problems are apparent at low-load and speed regions and are the major obstacle to their global acceptance. The deficiencies can be addressed by increasing the in-cylinder average charge temperature employing Exhaust Gas Recirculation (EGR). An experimental study is conducted to investigate the influence of utilizing EGR techniques, including Internal and External EGR, on combustion misfiring occurrence, combustion stability and exhaust emissions using a single cylinder two-stroke SI engine at idling, low and mid-load conditions. From the results, it is observed since the average in-cylinder charge temperature is increased, due to utilizing EGRs, engine’s low and mid-load irregular combustions (misfire) and exhaust emissions are remarkably supressed and almost all of misfire cycles eliminated depending on the percentage of EGRs. In terms of combustion stability, it is agreed in general the application of EGRs improves the cyclic variation of IMEP, Pmax and CA10 compared to conventional operation. However, applying Ex-EGR compared to In-EGR will deteriorate cyclic variability of IMEP and CA10.

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“…Among these models, the synthetic profile model for overall characterization of the scavenging process is widely used in engineering and scientific research [19,20,21,22,23]. The work of obtaining the synthetic scavenging profile has been illustrated in literature [24]as Fig.5 shows. The x-axis represents the ratio of the burned gas to all the gas in cylinder.…”

Section: -D Model Establishmentmentioning

confidence: 99%

Opposed-Piston Two-Stroke Diesel Engine Scavenging System Structural Optimization Based on GA-SVM

Liu¹,

Zhang²,

Zhao³

et al. 2017

Proceedings of the 3rd 2017 International Conference on Sustainable Development (ICSD 2017)

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Abstract. Opposed-Piston Two-Stroke (OP2S) diesel engines have been successfully used in many applications because of its high power efficiency. Uniform scavenging is used on OP2S diesel engines. Different from conventional diesel engine exchanging systems, intake ports and exhaust ports are located at each sides of the cylinder as OP2S scavenging system. A scavenging system optimization method, Genetic Algorithm-Support Vector Machine (GA-SVM), which employs Indicated Mean Effective Pressure (IMEP) as optimization goal is presented. The combinations of five key parameters including the width and length of intake and exhaust ports and the crank asymmetric angle are designed. All these combinations are calculated by GT-Power. The predicting model of OP2S diesel engine`s IMEP is built based on the 1D results. After verifying the accuracy of the predicting model, the optimized parameters are found. The results illustrate: using 1-D simulation coupled GA-SVM to optimize scavenging parameters in OP2S diesel engines is a rapid and effective method. The optimized IMEP is 12.86 bar. This paper presents some guidelines in the further OP2S diesel engines research. IntroductionThe opposed-piston two-stroke engine (OP2S) concept came into being in 1850`s. Wittig, a German engineer, designed and manufactured the world`s first coal gas fuel opposed-piston engine [1].From then on, many novel designs were brought out on aircrafts, marines and vehicles such as TS-3 engine manufactured by British Rootes company and 6-TD engine from Ukraine. However, rigid emission legislations slowed down the development of opposed-piston engines after 1970`s. In recent years, with the improvement of modern analytical tools, materials, and fuel supply system, engines from FEV, EcoMotor and Achates Power company have performed well in many fields [2,3,4,5,6]. OP2S draw more and more attention once again because of its simple, lightweight, high efficiency and high power density [7].In OP2S scavenging system, two pistons reciprocate opposite to each other in a common cylinder, piston port timings are controlled by two pistons. With this structural design, the need for cylinder head and valve mechanism are eliminated. In order to achieve better scavenging performance, larger ports area is wanted. However, according to the research by Peter Hofbauer [8], although larger intake and exhaust ports area can achieve better scavenging performance, shorter compression and expansion processes are inevitable. This will lead to the decrease of power efficiency. Zhenyu Zhang [9] also found larger crank asymmetric angle is benefit to the scavenging efficiency meanwhile compression ratio and expansion ratio decrease along with the increase of the crank asymmetric angle. This is also unfavorable to the development of engine performance. Therefore, in optimizing OP2S scavenging process, only taking scavenging efficiency into account is unreasonable. Thermal efficiency should also be taken into account. With the consideration of this, IMEP is selected as optimizing g...

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Study on the synthetic scavenging model validation method of opposed-piston two-stroke diesel engine

Cited by 26 publications

References 26 publications

Modeling of two-stroke aviation piston engines for control applications

Modeling of two-stroke aviation piston engines for control applications

Combustion and Emission Enhancement of a Spark Ignition Two-Stroke Cycle Engine Utilizing Internal and External Exhaust Gas Recirculation Approach at Low-Load Operation

Opposed-Piston Two-Stroke Diesel Engine Scavenging System Structural Optimization Based on GA-SVM

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