Objective To obtain the expiratory resistance in pressure oxygen mask under no overpressurecondition with numerical simulation method.
目的用数值模拟的方法获得加压供氧面罩无余压状态下呼气活门的呼气阻力。
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The mode of fluid flow is discussed. It is believed that there may be both lateral and vertical flows in the sand lens under the overpressurecondition.
Although the peak value of return shock is relatively low, the effect time is long and sometimes the scope excesses the maximal overpressure of some deflagration condition.