| Gas turbine has many advantages,such as small size,light weight,high power and flexible start-up.It has been used more and more in the field of military and civil ships.The gas turbine has a large amount of air intake and strict restrictions on air intake quality and air intake resistance,which makes the structure of the marine air intake system as a power unit more complex and bulkier.It is of great significance to conduct a systematic and comprehensive index investigation on the intake system,and accurately evaluate the impact of the intake system performance on the operation of gas turbine.In order to quickly and comprehensively evaluate the performance of large complex intake system of marine gas turbine,the following aspects are mainly carried out in this paper:(1)For the complex large-scale intake system of marine gas turbine,a feasible solution strategy is formulated for the large-scale intake filter and other components,and a partitioned porous medium replacement model of intake components is constructed to solve the difficulties in the overall performance simulation and high-precision numerical value prediction of the cross-scale intake filter structure,so as to realize the integrated simulation design and performance evaluation of the intake system of marine gas turbine.(2)According to the shipping requirements of a certain type of gas turbine power plant,two different types of intake systems,one side intake and two side intakes,are designed to deeply study the performance and change law of the complex large-scale intake system.The corresponding three-dimensional numerical prediction model is established to investigate the internal flow field of the original size model and the scaled model respectively,and to explore the performance of the single side intake system and the double side intake system.Combined with the structural characteristics of the intake system,the scheme of installing a practical rectifier structure in the intake chamber is designed and investigated to provide a basis for improving the overall performance of the intake system.(3)The numerical prediction results of simulation calculation are verified by model test,and the performance of intake system is further studied.A feasible simulation strategy is developed for the key components of the intake system to achieve a good reproduction of their characteristics.The design scheme of segmented flow sharing structure is adopted to solve the problem of LDV test measurement of internal flow field characteristics in large-scale zigzag and complex channels.On this basis,a complete test scheme is designed to complete the test and research of complex large-scale intake system under laboratory conditions.(4)The integrated fast prediction method of inlet system resistance characteristics is systematically summarized.Based on the numerical simulation prediction and experimental data,the performance and variation law of the complex large-scale intake system are comprehensively analyzed.The inlet non-uniformity index of the compressor is investigated by self-made program,and the influence of the increased inlet filter resistance is analyzed.Through in-depth analysis of the data,a prediction model of the resistance characteristics of the large-scale complex intake system is established,which provides a basis for the integrated design of the complex intake system of large and medium-sized ships. |
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