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活塞顶燃烧室的容积和表面是对发动机性能和热负荷有显著影响的两个重要参数。已有产品活塞的燃烧室容积可用实测法取得,尽管所测值也有一定的误差(包括测量方法、器具以及由于活塞尺寸公差造成的离散),但还具有工程精度意义,然而对燃烧室的表面积却几乎无法测量,因此采用解析函数积分法来精确计算燃烧室容积和表面积的名义值,以及由于各尺寸加工误差造成的离散范围是十分必要的。对于ω燃烧室,规则形状的回转体的体积和表面积计算,根本不存在任何技术上的困难,然而手算还是要耗费一些宝贵时间、且难保无误。有时为配合发动机工作过程的改进,需进行多种燃烧室方案的对比和优化,则手算的困难就更大了。为了提高效率和精度,本文给出计算方法,并编制电算程序。
The volume and surface of the piston top combustion chamber are two important parameters that have a significant effect on engine performance and thermal load. The volume of combustion chamber of an existing product piston can be measured by actual measurement. Although the measured value has some errors (including the measurement method, the appliance and the discrepancy caused by the piston dimensional tolerance), it also has the meaning of engineering accuracy. However, the combustion chamber surface area But it is almost impossible to measure. Therefore, it is necessary to use analytic integral method to accurately calculate the nominal values of the volume and the surface area of the combustion chamber, as well as the discrete range caused by machining errors of different sizes. For the ω-combustor, the volume and surface area of the regular-shaped rotors are calculated without any technical difficulties at all, yet it is expensive and time-consuming to calculate. Sometimes in line with the improvement of the engine work process, the need for a variety of combustion chamber program comparison and optimization, the greater the difficulty of calculating. In order to improve the efficiency and accuracy, this article gives the calculation method, and the preparation of computer programs.