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本文强调风流某点的相对静压是指井巷(或管道)内该点的绝对静压与井巷(或管道)外与该点同标高处的大气压力之差。可以根据地表空气状态参数及深度计算等熵静压作为该深度处的大气压力。对于有高差的倾斜巷道或漏风通道,在用等熵静压计算两断面间的通风阻力时,在使用“压能图”分析漏风通道的风流方向时,因为空气的实际密度往往不等于等熵密度,必须考虑该通道上两断面间的实际位能差与等熵位能差之差值。
This paper emphasizes that the relative static pressure at a certain point in the wind flow is the absolute static pressure at the point in the well (or pipe) and the difference between the atmospheric pressure at the same elevation outside the well (or pipe) and the point. Isentropic static pressure can be calculated as the atmospheric pressure at this depth based on the surface air state parameters and depth. For inclined sloping or air-leveled passages with elevation differences, when using iso-entropy to calculate the draft resistance between two sections, when analyzing the airflow direction of the leaking aisle using a “pressure-energy graph”, the actual density of the air is often not equal Entropy density, the difference between the actual energy difference and the isentropic energy difference between the two cross sections of the channel must be considered.