论文部分内容阅读
针对某主动式冷梁搭建实验台,在一次风量200 m3/h以内,供水温度15~17℃条件下进行实验,研究了:(1)诱导规律,(2)换热器翅片间流动状态、换热系数及压降,可评价冷梁性能的影响因素。实验结果表明,随着一次风量的增加,诱导比呈先增加后稳定的趋势;在二次风速0.8 m/s内微风速下,换热器翅片上的流态为层流;换热器各测试工况点的换热系数保持在15~28 W/(m2·K)范围内,随二次风量和水流量的增加而提高,但供水水温的增加导致换热系数降低;在二次风速0.6 m/s以内,二次风经过换热器的压降在2 Pa以内,呈指数增长。实验数据及结果对冷梁的设计人员具有直观参考价值。
Aiming at the experiment platform of an active cold beam, experiments were carried out under primary air volume of 200 m3 / h and water temperature of 15 ~ 17 ℃. (1) Induction law, (2) Flow state between heat exchanger fins , Heat transfer coefficient and pressure drop, cold beam performance evaluation of the factors. Experimental results show that the induction ratio tends to increase first and then stabilize with the increase of primary air flow rate. When the secondary air velocity is 0.8 m / s, the flow pattern on the fin of the heat exchanger is laminar. The heat transfer coefficient at the test condition point maintained within the range of 15-28 W / (m2 · K) and increased with the increase of the secondary air flow rate and water flow rate, but the increase of the water supply temperature resulted in the decrease of the heat transfer coefficient. Within 0.6 m / s, the pressure drop of the secondary air through the heat exchanger is within 2 Pa, exponentially increasing. Experimental data and results have an intuitive reference value for cold beam designers.