...Kingshuk Dasadhikari; Yoshihiro Kuwamura This paper presents a new, rapid, flexible approach for turbine blade section design combining algorithmic and inverse techniques to enable automatic generation of blade sections guaranteed to conform to multidisciplinary requirements, with the aim...

...Matthias Hüls; Lars Panning-von Scheidt; Jörg Wallaschek A major concern for new generations of large turbine blades is forced and self-excited (flutter) vibrations, which can cause high-cycle fatigue (HCF). The design of friction joints is a commonly applied strategy for systematic reduction...

...Georgios Ntanakas; Marcus Meyer; Kyriakos C. Giannakoglou In turbomachinery, the steady adjoint method has been successfully used for the computation of derivatives of various objective functions with respect to design variables in gradient-based optimization. However, the continuous advances...

.... This mode can be considered as a “functional” off-design operation of conventional fans, according to Binder [ 1 ]. It corresponds to situations when the sign of the work exchange is inverted compared with that of the design specification. Three regimes have been identified so far for windmilling situations...

...Jason Town; Douglas Straub; James Black; Karen A. Thole; Tom I-P. Shih Effective internal and external cooling of airfoils is key to maintaining component life for efficient gas turbines. Cooling designs have spanned the range from simple internal convective channels to more advanced double-walls...

... is referred to as pressure recovery. Since total pressure losses and construction costs increase drastically with diffuser length, it is strongly preferred to design shorter diffusers with steeper opening angles. However, these designs are more susceptible to boundary layer separation. In this paper...

... , “ Assessment of Unsteady Flows in Turbines ,” ASME J. Turbomach. , 114 ( 1 ), pp. 79 – 90 . 10.1115/1.2928001 [2] Paniagua , G. , and Denos , R. , 2007 , “ Unsteadiness in HP Turbines ,” Advances in Turbomachinery Aero-Thermo-Mechanical Design Analysis (VKI Lecture Series 2007-02), The von...

... Flow Sensitivity to Injection Location ,” ASME Paper No. GT2004-53258. 10.1115/GT2004-53258 [4] Bunker , R. S. , 2006 , “ Axial Turbine Blade Tips: Function, Design, and Durability ,” AIAA J. Propul. Power , 22 ( 2 ), pp. 271 – 285 . 10.2514/1.11818 [5] Lee , S. W. , Cheon...

... of pre-shock pressure waves at the inlet of the compressor. The optimization was performed at three operating points on the 100% speed line in order to maintain choke mass flow and surge margin. At the design point, the specific work input was kept equal. The baseline impeller was designed by using ruled...

...Fangyuan Lou; John C. Fabian; Nicole L. Key This paper introduces a new approach for the preliminary design and aerothermal analysis of centrifugal impellers using a relative diffusion effectiveness parameter. The relative diffusion effectiveness is defined as the ratio of the achieved diffusion...

...; final manuscript received November 3, 2017; published online February 21, 2018. Editor: Kenneth Hall. 22 10 2017 03 11 2017 Compressor stall Design Surge Turbomachinery blading Operability Considering that the Reynolds number of flow in compressors is generally large...

... of the nonaxisymmetric flow control method, several nonaxisymmetric vaned diffusers are designed to make the flow field uniform, which are believed to be beneficial for compressor stability. Finally, an experiment is carried out to validate the positive effects of the nonaxisymmetric vaned diffuser for stability...

...Penghao Duan; Choon S. Tan; Andrew Scribner; Anthony Malandra The measured loss characteristic in a high-speed cascade tunnel of two turbine blades of different designs showed distinctly different trends with exit Mach number ranging from 0.8 to 1.4. Assessments using steady Reynolds-averaged...

...Pranay Seshadri; Shahrokh Shahpar; Paul Constantine; Geoffrey Parks; Mike Adams Turbomachinery active subspace performance maps are two-dimensional (2D) contour plots that illustrate the variation of key flow performance metrics with different blade designs. While such maps are easy to construct...

...Hamid Hazby; Chris Robinson; Michael Casey; Daniel Rusch; Rene Hunziker The detailed design of the inducer of a high pressure ratio transonic radial compressor impeller with a design inlet tip relative Mach number of 1.4 is considered. Numerical analysis has been used to compare a datum impeller...

... in the 1D performance prediction of the six compressor stages is demonstrated. In addition, a number of design recommendations are presented to ensure that the detrimental effects associated with the presence of impeller exit recirculation can be minimized. Aside from the direct impact on the impeller...

... performed on the turbine nozzle. Guided by the visualization and numerical simulation, grooves were designed on the nozzle surface where the shock wave was originated and numerical simulations were performed to investigate the influence of grooves on the shock wave characteristics. Results indicate...

... to wake migration. This extra loss production should be considered in the detailed aerodynamic design process in view of further improvements in modern LPT blades, as well as for modeling the impact of wakes in steady computational fluid dynamics in which the mixing plane approach filters out wakes before...

...John D. Denton Turbomachinery design systems are usually the jealously guarded property of large companies, and the author is not aware of any for which the source code is freely available. This paper is aimed providing a freely available system that can be used by individuals or small companies...

... 16 08 2017 Computational fluid dynamics Fluid dynamics Heat transfer Turbomachinery blading Film cooling Heat transfer phenomena Compressor Turbine components Gas turbine engines Design The continuous efforts for improving efficiency and thermal performance in modern aero...