温度比对二维受限垂直射流穿透的影响

用数值方法研究了温度比对受限垂直射流穿透深度的影响。发现进口温度比是独立于动量比以外的重要影响参数。在一定的动量比下,冷射流垂直射入高温来流中,受热膨胀加速,动量较等温射流增加,从而穿透深度增加；热射流垂直穿入冷主流中,受冷却而减速,动量减少,导致穿透深度减小。 

INFLUENCE OF TEMPERATURE RATIO ON PENETRATION DEPTH OF 2D CONFINED CROSS FLOW

The influence of temperature ratio on the penetration depth of two-dimensional confined cross flow is investigated numerically.It is found that the temperature ratio of jet to main flow was an important parameter independent of momentum ratio.This phenomena can be explained in terms of the concept of "thermal drag".A cold jet injected perpendicularly into a confined hot air flow is heated and accelerated as the momentum ratio is given.The thermally induced pressure drop is converted into the momentum increase and consequently increases the penetration depth.On the contrary,a hot jet injected perpendicularly into a confined cold air flow for the given mometum ratio decreases its own momentum due to cooling by the mainflow.As a consequence,its penetration depth also is cut down.