Abstract

The strong flow field in a hoistway will cause a significant piston effect during the operation of high-speed/ultra-high-speed elevator. Thus, studying the airflow in the hoistway and the reasonable opening of ventilation holes is important. First, a three-dimensional geometric model of the ventilation holes (VHs) and elevator car was established. Based on this model, a multi-region dynamic layering method was proposed. The movement of the unsteady airflow in hoistways with different numbers of VHs and the interaction between the VHs were then analyzed. The correctness of the numerical simulation method was verified by comparing the results of the simulation, experiments and theoretical calculations. Finally, the influence of the number, location and cross-sectional area of the VHs on the airflow movement was analyzed, and the optimal opening positions of one and two pairs of VHs were discussed. The results showed that the variations of the number, location and cross-sectional area of the VHs had a significant influence on the airflow movement. According to the quantitative analysis of the ventilation efficiency, the optimal positions of one and two pairs of VHs were located in the middle of the hoistway and the upper and lower sides of the middle position, respectively.

摘要

高速/超高速电梯运行时，井道内的强流场会产生显着的活塞效应。因此，研究井道内的气流及通风孔的合理开设具有重要意义。首先，建立了通风孔（VH）和电梯轿厢的三维几何模型。基于该模型，提出了一种多区域动态分层方法。然后分析了具有不同数量VH的井道内非定常气流的运动以及VH之间的相互作用。通过模拟、实验和理论计算结果的对比，验证了数值模拟方法的正确性。最后分析了VH的数量、位置和横截面积对气流运动的影响，并讨论了一对和两对VH的最佳打开位置。结果表明，VH的数量、位置和横截面积的变化对气流运动有显着影响。根据通风效率的定量分析，一对和两对VH的最佳位置分别位于井道中部和中间位置的上下两侧。