{"product_id":"methodology-for-the-numerical-characterization-of-a-radial-turbine-under-steady-and-pulsating-flow-von-pablo-fajardo","title":"Methodology for the Numerical Characterization of a Radial Turbine under Steady and Pulsating Flow","description":"\u003cp\u003eDoctoral Thesis \/ Dissertation from the year 2012 in the subject Engineering - Mechanical Engineering, Universidad Politécnica de Valencia (Departamento de M¿aquinas y Motores T¿ermicos), language: English, abstract: The increasing use of turbochargers is leading to an outstanding research to\u003c\/p\u003e\u003cp\u003eunderstand the internal flow in turbomachines. In this frame, computational\u003c\/p\u003e\u003cp\u003efluid dynamics (CFD) is one of the tools that can be applied to contribute\u003c\/p\u003e\u003cp\u003eto the analysis of the fluid-dynamic processes occurring in a turbine. The\u003c\/p\u003e\u003cp\u003eobjective of this thesis is the development of a methodology for performing\u003c\/p\u003e\u003cp\u003esimulations of radial turbomachinery optimizing the available computational\u003c\/p\u003e\u003cp\u003eresources. This methodology is used for the characterization of a vaned-nozzle\u003c\/p\u003e\u003cp\u003eturbine under steady and pulsating flow conditions.\u003c\/p\u003e\u003cp\u003eAn important effort has been devoted in adjusting the case configuration\u003c\/p\u003e\u003cp\u003eto maximize the accuracy achievable with a certain computational cost. Concerning\u003c\/p\u003e\u003cp\u003ethe cell size, a local mesh independence analysis is proposed as a\u003c\/p\u003e\u003cp\u003eprocedure to optimize the distribution of cells in the domain, thus allowing to\u003c\/p\u003e\u003cp\u003euse a finer mesh in the most suitable places. Particularly important in turbomachinery\u003c\/p\u003e\u003cp\u003esimulations is the influence of the approach for simulating rotor\u003c\/p\u003e\u003cp\u003emotion. In this thesis two models have been compared: multiple reference\u003c\/p\u003e\u003cp\u003eframe and sliding mesh. The differences obtained using both methods were\u003c\/p\u003e\u003cp\u003efound to be significant in off-design regions. Steady flow CFD results have\u003c\/p\u003e\u003cp\u003ebeen validated against global measurements taken on a gas-stand.\u003c\/p\u003e\u003cp\u003eThe modeling of a turbine, installed either on a turbocharger test rig or\u003c\/p\u003e\u003cp\u003ean engine, requires the calculation of the flow in the ducts composing the\u003c\/p\u003e\u003cp\u003esystem. Those ducts could be simulated assuming a one-dimensional (1D)\u003c\/p\u003e\u003cp\u003eapproximation, and thus reducing the computational cost. In this frame of\u003c\/p\u003e\u003cp\u003eideas, two CFD boundary conditions have been developed. The first one allows\u003c\/p\u003e\u003cp\u003eperforming coupled 1D-3D simulations, communicating the flow variables from\u003c\/p\u003e\u003cp\u003eeach domain through the boundary. The second boundary condition is based\u003c\/p\u003e\u003cp\u003ein a new formulation for a stand-alone anechoic end, which intends to represent\u003c\/p\u003e\u003cp\u003ethe flow behavior of an infinite duct.\u003c\/p\u003e\u003cp\u003eFinally, the turbine was simulated under engine-like pulsating conditions.\u003c\/p\u003e\u003cp\u003eThe pulsating effects are analyzed separately in the different components of\u003c\/p\u003e\u003cp\u003ethe turbine and are compared with the results obtained in equivalent steady\u003c\/p\u003e\u003cp\u003esimulations, in order to evaluate their quasi-steadiness. The information from\u003c\/p\u003e\u003cp\u003ethe computations is used to describe the unsteady flow in the turbine components,\u003c\/p\u003e\u003cp\u003eand thus, contribute to engine modeling by the implementation of a\u003c\/p\u003e\u003cp\u003enew turbine model for its use in 1D codes.\u003c\/p\u003e\u003cdiv class=\"aw-variant-hidden-subtitle-div\" id=\"aw-variant-subtitle-9783656507239\"\u003e\u003ch3\u003e\u003c\/h3\u003e\u003c\/div\u003e","brand":"Libri","offers":[{"title":"Softcover - 9783656507239","offer_id":39446314516573,"sku":"9783656507239","price":52.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0622\/files\/3363bd34-7acd-4881-8a9f-8b5526c36cd1.jpg?v=1781325402","url":"https:\/\/shop.autorenwelt.de\/products\/methodology-for-the-numerical-characterization-of-a-radial-turbine-under-steady-and-pulsating-flow-von-pablo-fajardo","provider":"Autorenwelt Shop","version":"1.0","type":"link"}