【摘要】 掘进工作面压入式通风实际上是有限空间受限贴附射流通风。风流从圆形风筒射入掘进工作面空间形成射流区和回流区。根据流体射流理论，分析了压入式受限贴附射流通风射流产生过程及射流通风风流结构特征．由于受到巷道有限空间的限制，射流流场不能像自由贴附射流那样发展，形成了圆形贴附射流自由段、有限扩张段和收缩段。射流各段的长度与射流受限程度成反比。文中给出了射流各段长度及射流区和回流区断面平均流速和流量的计算模型。更多还原

【Abstract】 The forcing type ventilation at the tunnel heading in fact is the restrained wall- attached jet in the limited space, and the air-supply and air-return districts are formed at the same time with flowing air form the outlet into the space of the tunnel heading. The process of producing the air jet and the structure features of the air jet are analyzed based on the air jet theory. Because of the restriction of the limited space in the heading, the free part, limited expansion part and shrinked part of the circular section air jet are formed but not like the flow field shape of the free wall-attached air jet, and the length of the parts is at inverse proportion with the restricted degree of the air jet. Furthermore, the mathematical models. about the length of every jet part, the mean velocity of the air-supply and air-return districts and the flowing quantity of the air jet are established based on the academic analysis in this paper. 1 fig., l0refs.更多还原