汽车化油器腔体内流动实验研究及变分有限元解

The Finite Element Design and Experiment in Cavity of Carburettor

本文对具有双重喉管的双腔201 A3化油器腔体内流动进行了研究,首先用变分有限无法对腔内流动进行计算,给出了不同工况下阀门全开时化油器主油系的供油特性(包括沿程真空度分布曲线、化油器大喉管、小喉管边缘的真空度随进气流量的变化曲线)。然后对模型进行实验分析,与计算相比较,两者结果吻合较好。通过二元流与一元流计算的比较,揭示了有限元计算有助于化油器的节油和改善其气动性能。

In this paper the authors present a variational finite element principle tocompute the fuel supply characteristics in the carburettor. The principle is employed to obtain the vacuum performance at the fuel outlet and the fuel supply characteristics of the main fuel system of the carburettor in a condition of opening values with distinguishing performance of the vacuum along the inside wall of the carburettor. Details of the results obtained in the corresponding test are also reported in this paper. Good agreement is found between the computational results and those of the test.Compared with 1-D computation, 2-D computation is not only good for saving the fuel, but also good for improving the aerodynamic performance of the carburettor. It provides a new approach for the design of the carburettor.