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内燃机台架试验国家标准 GB 1105—74存在一些问题,其中标定功率核算方法的问题是:在不同大气状况下测定结果核算所得的标定功率相差较大,当大气密度小于标准大气状况下的大气密度时核算所得的标定功率偏大,当大气密度大于标准大气状况下的大气密度时核算所得的标定功率偏小。本文从试验及原理上说明其问题所在。从而提出一种新办法(可叫油耗线法),其原则与 SAEJ-270相同,(即从等过量空气系数α下的燃烧效率相同出发,求得在标准大气状况及标定油量下的指示油耗率,据以计算标定指示功率,再计入机械损失的影响得出标定有效功率)。但方法上比较简便,适合我国国情,以试验证明其符合要求。进一步就国外试验标准进行分析,原理上阐明所提油耗线法的合理性及其特殊优点。
There are some problems in the national standard GB 1105-74 of the internal combustion engine bench test. The problem of calibration power calculation method is that the calibration power calculated by the measurement results varies greatly under different atmospheric conditions. When the atmospheric density is smaller than the atmospheric density under standard atmospheric conditions The resulting calibration power is too large. When the atmospheric density is greater than the atmospheric density under standard atmospheric conditions, the calculated calibration power is small. This article explains the problem from the experiment and principle. A new method (called fuel consumption method) is proposed. The principle is the same as that of SAEJ-270 (that is, from the same combustion efficiency under equal excess air coefficient α, the indication under standard atmospheric conditions and calibrated oil quantity is obtained Fuel consumption rate, calculated according to the instructions indicated power, and then included in the impact of mechanical loss of calibration effective power). But the method is relatively simple, suitable for our national conditions, with the test proved that they meet the requirements. Further analysis of foreign test standards, the rationale for the proposed fuel consumption law and its special advantages.