Evaporation erosion of the contacts is one of the fundamental failure mechanisms for relays. In this paper, the evaporation erosion characteristics are investigated for the copper contact pair breaking a resistive dir...Evaporation erosion of the contacts is one of the fundamental failure mechanisms for relays. In this paper, the evaporation erosion characteristics are investigated for the copper contact pair breaking a resistive direct current （dc） 30 V/10 A circuit in the air. Molten pool simulation of the contacts is coupled with the gas dynamics to calculate the evaporation rate. A simplified arc model is constructed to obtain the contact voltage and current variations with time for the prediction of the current density and the heat flux distributions flowing from the arc into the contacts. The evaporation rate and mass variations with time during the breaking process are presented. Experiments are carried out to verify the simulation results.展开更多
HDPE土工膜全称高密度聚乙烯膜,也被称为HDPE防渗膜,是以(中)高密度聚乙烯树脂为原料生产的一种防水阻隔型材料。HDPE土工膜抗撕裂物理力学性能优良,耐低温、抗老化、耐腐蚀,且具有较长使用寿命,现已被广泛使用在污水处理厂防渗、人工...HDPE土工膜全称高密度聚乙烯膜,也被称为HDPE防渗膜,是以(中)高密度聚乙烯树脂为原料生产的一种防水阻隔型材料。HDPE土工膜抗撕裂物理力学性能优良,耐低温、抗老化、耐腐蚀,且具有较长使用寿命,现已被广泛使用在污水处理厂防渗、人工湖防渗、污水蒸发池防渗、隔油池防渗、沉淀池的内衬和二次衬层等防渗工程。以土库曼斯坦南约洛坦气田某天然气处理厂的污水蒸发池为例,对2 mm HDPE土工膜作为污水蒸发池防渗层的优越性进行了技术探讨,为以后工程中采用HDPE土工膜作为污水蒸发池防渗层提供了工程经验。展开更多
基金supported by National Natural Science Foundation of China(Nos.51377038,51307030)
文摘Evaporation erosion of the contacts is one of the fundamental failure mechanisms for relays. In this paper, the evaporation erosion characteristics are investigated for the copper contact pair breaking a resistive direct current （dc） 30 V/10 A circuit in the air. Molten pool simulation of the contacts is coupled with the gas dynamics to calculate the evaporation rate. A simplified arc model is constructed to obtain the contact voltage and current variations with time for the prediction of the current density and the heat flux distributions flowing from the arc into the contacts. The evaporation rate and mass variations with time during the breaking process are presented. Experiments are carried out to verify the simulation results.
文摘HDPE土工膜全称高密度聚乙烯膜,也被称为HDPE防渗膜,是以(中)高密度聚乙烯树脂为原料生产的一种防水阻隔型材料。HDPE土工膜抗撕裂物理力学性能优良,耐低温、抗老化、耐腐蚀,且具有较长使用寿命,现已被广泛使用在污水处理厂防渗、人工湖防渗、污水蒸发池防渗、隔油池防渗、沉淀池的内衬和二次衬层等防渗工程。以土库曼斯坦南约洛坦气田某天然气处理厂的污水蒸发池为例,对2 mm HDPE土工膜作为污水蒸发池防渗层的优越性进行了技术探讨,为以后工程中采用HDPE土工膜作为污水蒸发池防渗层提供了工程经验。
