Direct numerical simulations of flutter instabilities over a vibrating turbine blade cascade

نویسندگان

چکیده

This paper presents direct numerical simulations (DNS) on unsteady turbulent flow in a vibrating low-pressure turbine blade cascade to predict the flutter instabilities and explores effects of oscillations structure separation point. The spectral/hp element method is employed for three-dimensional domain. enables capturing more details about vortex generations compared URANS methods. can aid understanding physics these complex fluid–structure interaction problems while it requires much less computational time other DNS models. vibration frequency varied from 5.2 Hz 10.3 with maximum amplitude 3% chord length at tip. results illustrate that generation becomes stronger over blades higher frequencies stationary ones. main reason additional recirculations oscillating disturbance due its interactions shear-layer cascade. It seen shedding growing around trailing edge become suction surface blade. occurs Ssep?S0=0.391, 0.372 f=5.2Hz.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Ducted Turbine Blade Optimization Using Numerical Simulation

This paper presents a combined blade element (BE), computational fluid dynamics (CFD) method for performance analysis and optimization of ducted turbines. The model is similar to standard blade element momentum theory, except that CFD replaces the momentum equation for determining the induction factors. This eliminates many assumptions used in applying the typical blade element momentum (BEM) t...

متن کامل

Turbine Blade Cascade Heat Transfer Analysis Using CFD –A Review

Heat transfer analysis on a turbine blade cascade using CFD is reviewed in this paper based upon the literature available. The flow conditions across turbine blades are complex because of three dimensional configuration of the blade. Axial flow turbine blade design is hectic because understanding of control flows, prediction and analysis is a tedious task. The flow behaviour in a turbine blade ...

متن کامل

Two - and Three - Dimensional Turbine Blade Row Flow Field Simulations

A major problem area a s s o c i a t e d w i t h t h e swcess fu L d e s i g n and o p e r a t i on of modern gas t u r b i n e e n g i n e s is t h e t u r b i n e . This s e c t i o n r e p r e s e n t s a c o n s i d e r a b l e cha1 Lenge t o both t h e d e s i g n and r e s e a r c h e n g i n e e r as i t c o n t a i n s s i g n i f i c a n t r e g i o n s of complex three-dimensional f l...

متن کامل

Direct Numerical Simulations of High Speed Flow over Cavity

Direct numerical simulations are used to investigate the effect of Mach number on the unsteady flow of an open cavity. The implicit solution is obtained for the compressible Navier-Stokes Equations using compact sixth-order spatial differencing coupled with tenth-order implicit filters. Results for transonic and subsonic flow over a two dimensional cavity are presented for the sound pressure le...

متن کامل

Assessing the Sensitivity of Turbine Cascade Flow to Inflow Disturbances Using Direct Numerical Simulation

Direct numerical simulations (DNS) are conducted of flow through a linear low-pressure turbine cascade with T106 blade sections at Re=60,000, based on chord and isentropic exit velocity. A highly efficient in-house compressible Navier-Stokes solver was adapted for turbine cascade simulations and applied to investigate the effect of inflow disturbances on transition behaviour and blade profile l...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Journal of Fluids and Structures

سال: 2021

ISSN: ['1095-8622', '0889-9746']

DOI: https://doi.org/10.1016/j.jfluidstructs.2021.103324