CAJ | 학술논문

基于存在自发凝结的均质与非均质湿蒸汽两相流动，开发了基于汽液两相双流体模型和k-ε-kp 湍流模型的计算方法，对二维叶栅中的均质与非均质凝结流动进行了数值研究与分析，结果表明，蒸汽中含有一定量的杂质可以有效地改善湿蒸汽的流动状况，减小非平衡凝结流动产生的热力学损失。对由外界提供的凝结核心在不同的初始浓度和初始半径时，叶栅内的流动状态进行了数值分析，结果表明：非均质凝结流动随初始粒子半径的减小与浓度的增大而增强，自发凝结流动被逐渐抑制，但是完全的非均质凝结流动使得叶栅出口处的湿度增加，所以根据不同的叶栅应选择合适的初始粒子半径和浓度。
기우존재자발응결적균질여비균질습증기량상류동，개발료기우기액량상쌍류체모형화k-ε-kp 단류모형적계산방법，대이유협책중적균질여비균질응결류동진행료수치연구여분석，결과표명，증기중함유일정량적잡질가이유효지개선습증기적류동상황，감소비평형응결류동산생적열역학손실。대유외계제공적응결핵심재불동적초시농도화초시반경시，협책내적류동상태진행료수치분석，결과표명：비균질응결류동수초시입자반경적감소여농도적증대이증강，자발응결류동피축점억제，단시완전적비균질응결류동사득협책출구처적습도증가，소이근거불동적협책응선택합괄적초시입자반경화농도。
In view of spontaneous homogeneous and heterogeneous condensation flow of two -phase wet steam,a calculation method is developed based on vapor-liquid two-phase flow model and k-ε-kp turbulence model .The numerical study is conducted on the homogeneous and heterogeneous condensation flow in 2D cascade,and the results show certain quantity of foreign matter in steam can effectively improve the flow behavior of wet steam and reduce the thermodynamic loss due to non-equilibrium condensation flow .A numerical analysis is conducted for the flow behavior in cascades at different initial concentration and initial size of foreign condensation nucleus .The results show that , with smaller initial particle size and higher concentration ,the heterogeneous condensation flow will become stronger and the spontaneous condensation flow is more restrained.However,completely heterogeneous condensation flow will increase the moisture at the outlet of cascades . Therefore,appropriate initial particle size and concentration shall be selected for different cascades .