| 王华,孟凡茂,孙文策,邹家宁.水浊度和提热量对太阳池盐梯度层稳定性综合影响[J].,2011,(4):512-517 |
| 水浊度和提热量对太阳池盐梯度层稳定性综合影响 |
| Combined influence of turbidity and heat extraction on stability of salt gradient layer of solar pond |
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| DOI：10.7511/dllgxb201104008 |
| 中文关键词: 太阳池 盐梯度层 线性稳定性 浊度 |
| 英文关键词: solar pond salt gradient layer linear stability turbidity |
| 基金项目:国家自然科学基金资助项目(50676016);热能与动力工程河南省特色专业建设资助项目(508027). |
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| 中文摘要: |
| 研究了太阳池非对流层在温度梯度作用下的重力稳定性问题．考虑了池水对于太阳辐射的吸收,并假设边界上一定的热通量为导热微分方程的边界条件,基于控制方程的弱解形式采用Galerkin方法得到对流开始发生的临界条件．给出了池水的浊度(消光系数)和提热量 f 对于非对流层(也叫梯度层)稳定性的影响．结果表明,临界稳定值 Ra c受水体浊度的影响很小,当浊度变大后, Ra c略有下降；考虑提热量 f 和浊度的综合影响,当 f 为0.65~0.70时,池水浊度对梯度层稳定性的影响最小；当 f 小于此范围时,随着梯度层内浊度的增大, Ra c增大,系统趋向稳定；当 f 大于此范围时,随着梯度层浊度的增大, Ra c减小,系统趋向于不稳定． |
| 英文摘要: |
| The gravitational stability of NCZ (non-convective zone, also called gradient layer) of solar pond subjected to temperature gradient was researched. The analysis considers solar energy absorption in the layer and assumes certain heat flux values as boundary conditions for the heat-conduction differential equation. The marginal states for the onset of convection were obtained using a Galerkin method based on a weak formulation of the governing equations. The influence of turbidity (extinction coefficient) and heat extraction on the NCZ stability was studied. The analysis of linear stability on the salt gradient layer indicates that the critical stability value Ra c is not much susceptible to the turbidity of the water, and a turbid pond tends to a decreasing Ra c. Synthetically considering the influence of heat extraction and water turbidity, when the heat extraction f is 0.65-0.70, the influence of water turbidity on stability of NCZ is the least. When f is smaller than this value, Ra c increases with the increase of turbidity, and system tends stable; but when f is larger than this value, Ra c decreases with the increase of turbidity, and system tends unstable. |
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