A Prediction Method for Power Generation Efficiency of Two-Stage Compression-Expansion Generator
A technology of power generation efficiency and compression expansion, which is applied in the field of prediction of power generation efficiency of two-stage compression expansion generators, can solve the problems of time-consuming machine time, lack of accurate knowledge, performance prediction, control analysis and real-time simulation, etc., and achieve calculation speed fast effect
Active Publication Date: 2022-02-22
HARBIN ENG UNIV
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Although the complex quasi-dimensional and multi-dimensional models have the potential to reproduce the physical and chemical reactions in the fuel injection combustion process, they are still limited by the lack of accurate knowledge of certain processes, and the amount of calculation is considerable, and the computer time is too long to meet the performance requirements. Requirements for prediction, control analysis and real-time simulation
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[0043] A method for predicting power generation efficiency of a two-stage compression-expansion generator, the method comprising the following steps:
[0044] The working process of the engine is divided into six stages: the first compression, the second compression, intercooling, combustion, the first expansion, and the second expansion, and the step size is taken for each stage is 0.1, which corresponds to each stage of the ideal cycle of mixed heating, and iteratively solves it;
[0045] Step 1: Determine the boundary conditions and initial conditions according to the geometric parameters and initial parameters of the engine used, and give the adiabatic index (entropic index) κ; the adiabatic index refers to the index of the ideal gas reversible adiabatic process;
[0046] Step 2: In the first compression stage, calculate with the adiabatic index κ=1.4, and use the ideal gas reversible process calculation formula to obtain the temperature T after the first compression stag...
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The present invention proposes a method for predicting the power generation efficiency of a two-stage compression-expansion generator. The working process of the engine is specifically divided into six stages: first compression, second compression, intercooling, combustion, expansion, and expansion. The length is 0.1, which corresponds to each stage of the ideal cycle of mixed heating, iteratively solves, and the obtained pressure is integrated to calculate the effective work W of the working process, and then according to the effective work W and the total input heat Q total Calculate the effective thermal efficiency by the ratio of the coupled motor, and multiply it by the efficiency of the coupled motor, which is the power generation efficiency of the entire two-stage compression-expansion generator; the present invention is not limited to a specific operating condition, and is relatively less dependent on the specific model of the engine Compared with the CFD model, the calculation speed is relatively fast, and it can be widely used in the simulation of the working process, the research of engine performance prediction, fault diagnosis, etc., and provides a numerical prediction method for the optimization design of the thermal efficiency of a wider range of generators.
Description
technical field [0001] The invention relates to the field of generator working process optimization, in particular to a method for predicting power generation efficiency of a two-stage compression-expansion generator. Background technique [0002] In recent years, with the continuous development of society, the problem of energy shortage has become increasingly prominent. Among various forms of energy, electric energy is one of the most widely used energy sources, and electric energy is mainly provided by diesel engines in industries such as vehicles and ships. Therefore, under the condition that the negative influence caused by the traditional diesel engine is increasing day by day, the new free-piston internal combustion generator (FPLA) has become a research hotspot. FPLA is the product of the direct coupling between the free piston internal combustion engine (FPE) and the linear generator (LA), and combines the advantages of both to directly convert the chemical energy ...
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IPC IPC(8): G01R31/34
CPCG01R31/343
Inventor 韩笑刘龙刘俊杰梅齐昊赵豪许智淳唐元亨安琛
Owner HARBIN ENG UNIV