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采用电加热的方法,在恒热流和单独底面加热的情况下,实验研究了在不同风速和腔体倾角下风向角对一侧全开的圆柱形腔体热损失特性的影响。实验结果表明:风向角对混合对流热损失努塞尔数Nu_(c,w)的影响比较复杂,其影响与风速和腔体倾角有关;风向角对辐射热损失努塞尔数Nu_(r,w)的影响较小,Nu_(r,w)随风向角的变化只在一小范围内波动。风向角对导热、辐射和混合对流热损失影响较小;辐射和导热热损失随风向角变化有着相同的变化趋势,且它们近似相等,但均远小于混合对流热损失。
The influence of the wind direction angle on the heat loss characteristics of a fully open cylindrical cavity at different wind speeds and cavity inclination angles was experimentally investigated by means of electric heating with constant heat flow and heating of the sole sole. The experimental results show that the influence of the wind direction angle on the heat loss Nusselt number Nu_ (c, w) is quite complicated, and the influence is related to the wind speed and cavity inclination. The wind direction angle has no significant effect on the radiative heat loss Nusselt Nu_ (r, w), the variation of Nu_ (r, w) with wind direction only fluctuates within a small range. The wind direction angle has little influence on the heat loss of heat conduction, radiation and mixed convection. The heat loss of radiation and heat conduction has the same trend with the change of wind direction angle, and they are approximately equal, but both are far less than the heat loss of mixed convection.