【Mechanical Equipment Technology Exchange Edition】Mechanical Equipment 【Daily Question】20191016
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Question: What are the reasons for the deflection of airflow in the tapered section of a converging-tapered nozzle? There are no answers provided for this series of posts; fellow netizens are free to share their own opinions – just reply with what you understand. Replies earn rewards ranging from 5 to 15 points; all forum members are welcome to participate actively and support the development of the forum! ! ! Chemical Equipment and Machinery
(1) When p1/p0 is greater than or equal to the critical pressure ratio, the flow velocity and direction at the nozzle exit section AC are the same as those at the throat interface AB; the inclined portion does not undergo expansion and serves only as a guide. (2) When the pressure ratio p1/p0 at the nozzle exit section is less than the critical pressure ratio, as the gas flow expands to point AB, the pressure equals the critical pressure and the velocity is the critical velocity. Furthermore, the steam continues to expand slightly ahead of the beveled section ABC; the pressure decreases, the velocity increases, exceeding the critical speed, and the direction of the gas flow is deflected by an angle.