CAJ | 학술논문

埋地高压天然气经小孔泄漏会导致土壤冻结形成冻土，应用一元气体动力学、流体力学和传热学知识建立了天然气小孔泄漏吸热率模型和土壤稳态温度场模型，并进行了实例计算。结果表明：当天然气输送压力小于临界压力，小孔泄漏吸热率随压力的增大而增大；当天然气输送压力大于等于临界压力，小孔泄漏吸热率达到最大值；冻土厚度随土壤热导率或空气对流传热系数的增大而减小，但土壤热导率对其影响较小，空气对流传热系数对其影响较大。
매지고압천연기경소공설루회도치토양동결형성동토，응용일원기체동역학、류체역학화전열학지식건립료천연기소공설루흡열솔모형화토양은태온도장모형，병진행료실례계산。결과표명：당천연기수송압력소우림계압력，소공설루흡열솔수압력적증대이증대；당천연기수송압력대우등우림계압력，소공설루흡열솔체도최대치；동토후도수토양열도솔혹공기대류전열계수적증대이감소，단토양열도솔대기영향교소，공기대류전열계수대기영향교대。
The pinhole leakage of buried high pressure gas pipeline will lead to frozen soil. Applying the knowledge of gas dy-namics, fluid mechanics and heat transmission science, the pinhole leakage absorption rate of heat model and stationary tempera-ture field in the soil model are obtained. And the model is used in real calculation. The results show that if the pressure of pipeline is smaller than the chamber pressure, the pinhole leakage absorption rate of heat increases with the increase of pressure of pipeline. If the pressure of pipeline is as much or bigger than the chamber pressure, the pinhole leakage absorption reaches its maximum. The thickness of frozen soil reduces with the increase of soil’s thermal conductivity and air’s heat transfer co-efficiency, but the soil’s thermal conductivity exerts relatively small effect on the scope of frozen soil, while relatively big effect on the air’s heat transfer co-efficiency.