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飞机上采用氦气示踪法测量空气流量,其原理如图1所示。微量氦气喷入空气流的上游,在下游测量空气中含氦的容积百分数,根据喷入的氦气流量(kg/s)和测得的氦气容积百分数,即可算出空气的流量Ga(kg/s)。本文提出用煤油补燃气体分析法测量空气流量,与氦气示踪法比较,除成本低外,因需校准的是液体流量计(煤油流量计),所以简单方便。煤油补燃气体分析法测量空气流量的原理如图2所示。煤油经流量计喷入燃烧器(即CO_2发生器),与从主气流引入的空气混合燃烧,产生CO_2和因燃烧不完全而残留的部分
The aircraft uses helium tracer method to measure air flow, the principle shown in Figure 1. The trace amount of helium is injected upstream of the air flow and the volume percentage of helium contained in the air is measured downstream. The flow rate of air Ga (kg / s) and the measured volume percentage of helium gas can be calculated kg / s). In this paper, the kerosene gas analysis method is used to measure the air flow. Compared with the helium tracer method, besides the low cost, the liquid flow meter (kerosene flow meter) needs to be calibrated, so it is simple and convenient. The principle of kerosene gas analysis of air flow measurement method shown in Figure 2. The kerosene is injected into the burner (ie, the CO 2 generator) via the flow meter and mixed with the air introduced from the main air stream to produce CO 2 and the remaining portion due to incomplete combustion