低温氢气排放过程数值模拟

Numerical simulation of cryogenic gaseous hydrogen emission

以低温氢气安全排放为目的,采用数值模拟方法对低温氢气直接排放和燃烧排放的流场进行分析。流场仿真计算采用了标准双方程k-ε湍流模型和氢氧单步燃烧模型。研究参数包括氢排放压力、流量、温度和环境风速,评价指标为氢扩散范围和燃烧范围。计算结果表明:燃烧排放燃烧范围小于直接排放氢扩散范围;排放压力增加、流量增大和温度降低均会使氢扩散范围和燃烧范围变大。

The cryogenic emission and burning emission of cryogenic gaseous hydrogen were in- vestigated numerically for safe emission. The standard k-e turbulence model and the uni-step H-O re- action model was used in the simulation calculation to get the gaseous hydrogen emission pressure, mass flow rate, temperature, environment wind speed, as well as hydrogen diffuse area and burning area as the evaluation index. The calculated results show that the burnir/g area by burning emission is smaller than the diffuse area by cryogenic emission, and increase of emission pressure, amplification of mass flow rate and reduction of temperature can lead to the wide diffuse area and burning area of gaseous hydrogen.