船用燃气轮机回热器设计的数值研究

Numerical Study on the Design of a Regenerator for Marine Gas Turbines

回热器是提高船用燃气轮机效率的关键部件,其性能的优劣直接影响燃气轮机的特性。以往的文献在介绍回热器设计时,没有考虑冷热两侧气体(分别为空气和燃气)不同的热力性质。考虑这一实际情况,以某型船用三轴简单循环燃气轮机为母型进行回热改造,采用迭代计算的方法,编制计算程序,进行回热器的数值设计,并分析其对燃气轮机的性能的影响。结果表明,随着回热器回热度的增大,燃气轮机的效率不断提高;但当回热度超过一定值时,效率不仅不再提高,反而有所降低。

The regenerator is a key component in a marine gas turbine and determines the performance of the gas turbine directly.However,in most open literatures related to regenerators,the different thermal characteristics of air and gas on the hot-and cold-side were not considered.In this paper,a marine tri ple-shaft simple cycle gas turbine was adopted as the prototype,and an improved marine regenerator was designed using the iterative approach.Then,the exact effects induced by the regenerator on the gas turbine were analyzed.The results show that the gas turbine’s working efficiency increases along with the regenera tor effectiveness,and decreases considerably when the regenerator effectiveness exceeds a critical value.