This paper implemented cooling configuration design on certain gas turbine HP rotor using parameterized method.It is convenient for complicated gas turbine blade modeling using parameters and also benefit for the geom...This paper implemented cooling configuration design on certain gas turbine HP rotor using parameterized method.It is convenient for complicated gas turbine blade modeling using parameters and also benefit for the geometry modify in later period.Parameterized modeling is the foundation of air cooling turbine blade design method engineering application.Mesh quality can be awarded when generated complicated cooling configuration blade grids,and also the increase of calculation error can arise by many mesh blocks.Film cooling and serpentine passage can effectively enhance the cooling effectiveness and protect blade.展开更多
Combining with the low temperature material properties and the boiling heat transfer coefficient of specimen immersed in the liquid nitrogen, a numerical model based on metallo-thermo-mechanical couple theory was esta...Combining with the low temperature material properties and the boiling heat transfer coefficient of specimen immersed in the liquid nitrogen, a numerical model based on metallo-thermo-mechanical couple theory was established to reproduce the deep cryogenic treatment （DCT） process of a newly developed cold work die steel Cr8Mo2SiV （SDC99）. Moreover, an experimental setup for rapid temperature measurement was designed to validate the simulation results. The investigation suggests that the differences in temperature and cooling rate between the surface and core of specimen are very significant. However, it should be emphasized that the acute temperature and cooling rate changes during DCT are mainly concentrated on the specimen surface region about 1/3 of the sample thickness. Subjected to DCT, the retained austenite of quenched specimen continues to transform to martensite and finally its phase volume fraction reduces to 2.3%. The predicted results are coincident well with the experimental data, which demonstrates that the numerical model employed in this study can accurately capture the variation characteristics of temperature and microstructure fields during DCT and provide a theoretical guidance for making the reasonable DCT procedure.展开更多
The characteristics of pressure drop and heat transfer of air across the corrugated tubes with three values of row number were investigated experimentally by measuring the average heat transfer coefficients and fricti...The characteristics of pressure drop and heat transfer of air across the corrugated tubes with three values of row number were investigated experimentally by measuring the average heat transfer coefficients and friction factors. The results were compared with that of the corresponding same row number smooth tube bundles.The corresponding correlation for the Nusselt numbers and Euler numbers vs the Reynolds numbers for the corrugated tubes were obtained. It was found that the corrugated tube bundles will reach the developed state at a smaller row number compared with the smooth tube bundles. Within the range of Reynolds numbers of the present work, the heat transfer coefficients and the friction factors of the corrugated tube bundles were 13.6%-29.2% and 3.2%-60.0% higher than those of the smooth tube bundles respectively.展开更多
基金Sponsored by the National Natural Science Foundation of China(Grant No. 50476028)
文摘This paper implemented cooling configuration design on certain gas turbine HP rotor using parameterized method.It is convenient for complicated gas turbine blade modeling using parameters and also benefit for the geometry modify in later period.Parameterized modeling is the foundation of air cooling turbine blade design method engineering application.Mesh quality can be awarded when generated complicated cooling configuration blade grids,and also the increase of calculation error can arise by many mesh blocks.Film cooling and serpentine passage can effectively enhance the cooling effectiveness and protect blade.
基金Project (51171104) supported by the National Natural Science Foundation of China
文摘Combining with the low temperature material properties and the boiling heat transfer coefficient of specimen immersed in the liquid nitrogen, a numerical model based on metallo-thermo-mechanical couple theory was established to reproduce the deep cryogenic treatment （DCT） process of a newly developed cold work die steel Cr8Mo2SiV （SDC99）. Moreover, an experimental setup for rapid temperature measurement was designed to validate the simulation results. The investigation suggests that the differences in temperature and cooling rate between the surface and core of specimen are very significant. However, it should be emphasized that the acute temperature and cooling rate changes during DCT are mainly concentrated on the specimen surface region about 1/3 of the sample thickness. Subjected to DCT, the retained austenite of quenched specimen continues to transform to martensite and finally its phase volume fraction reduces to 2.3%. The predicted results are coincident well with the experimental data, which demonstrates that the numerical model employed in this study can accurately capture the variation characteristics of temperature and microstructure fields during DCT and provide a theoretical guidance for making the reasonable DCT procedure.
文摘The characteristics of pressure drop and heat transfer of air across the corrugated tubes with three values of row number were investigated experimentally by measuring the average heat transfer coefficients and friction factors. The results were compared with that of the corresponding same row number smooth tube bundles.The corresponding correlation for the Nusselt numbers and Euler numbers vs the Reynolds numbers for the corrugated tubes were obtained. It was found that the corrugated tube bundles will reach the developed state at a smaller row number compared with the smooth tube bundles. Within the range of Reynolds numbers of the present work, the heat transfer coefficients and the friction factors of the corrugated tube bundles were 13.6%-29.2% and 3.2%-60.0% higher than those of the smooth tube bundles respectively.
