PDF Publication Title:
Text from PDF Page: 066
CHAPTER 6 Conclusions The unsteady flow in pipes and a radial turbine have been computed using LES. The purpose of the pipe flow computations was to study the non-pulsatile and pulsatile internal flow in curved geometries, which are relevant to the inlet to the turbo-charger turbine. For one of the used geometries, a comparison with measured data has also been performed. The results show that an Implicit LES turbulence modelling approach gives the best agreement with measured velocities among the tested turbulence modelling approaches. For the pulsatile flow a phase shift between the pressure and the bulk flow has been found. The phase shift varies during the pulse, depending on the balance between the different terms in the momentum equation. The phase shift also implies that flow in the boundary layer and in the core region of the pipe are out phase, since the low momentum flow in the boundary layer is more sensitive to changes in the axial pressure gradient than the flow in the core region. This results in an increased mixing in the region near the wall resulting in higher heat transfer to the walls. The bends in the pipe introduced secondary flow structures. In the first bend, two counter-rotating vortices are created and the axial velocity compo- nent after the bend is not uniformly distributed. When this non-uniform axial velocity distribution enters a second bend, situated in an orthogonal plane downstream of the first bend, a swirling motion is created downstream of the second bend. This swirling motion is also affected by the Dean vortices created in the bends upstream. Since an exhaust manifold can be viewed as being composed of straight and bent pipe sections, the flow into the turbine has non- negligible secondary flow structures in addition to the pulsatile axial flow. The pulsatile flow in the turbine also increases the heat losses. This all together implies that a turbocharger turbine for an IC-engine will have operation condi- tions that are far away from the conditions that they are designed and tested for. The effect of the pulsatile flow on the turbine performance has been assessed by conducting computation at different frequencies and mass flows. The major conclusions of that study are as follows: 56PDF Image | Numerical computations of the unsteady flow in a radial turbine
PDF Search Title:
Numerical computations of the unsteady flow in a radial turbineOriginal File Name Searched:
radial-turbine-unsteady-flows.pdfDIY PDF Search: Google It | Yahoo | Bing
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
IT XR Project Redstone NFT Available for Sale: NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Be part of the future with this NFT. Can be bought and sold but only one design NFT exists. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Turbine IT XR Project Redstone Design: NFT for sale... NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Includes all rights to this turbine design, including license for Fluid Handling Block I and II for the turbine assembly and housing. The NFT includes the blueprints (cad/cam), revenue streams, and all future development of the IT XR Project Redstone... More Info
Infinity Turbine ROT Radial Outflow Turbine 24 Design and Worldwide Rights: NFT for sale... NFT for the ROT 24 energy turbine. Be part of the future with this NFT. This design can be bought and sold but only one design NFT exists. You may manufacture the unit, or get the revenues from its sale from Infinity Turbine. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Supercritical CO2 10 Liter Extractor Design and Worldwide Rights: The Infinity Supercritical 10L CO2 extractor is for botanical oil extraction, which is rich in terpenes and can produce shelf ready full spectrum oil. With over 5 years of development, this industry leader mature extractor machine has been sold since 2015 and is part of many profitable businesses. The process can also be used for electrowinning, e-waste recycling, and lithium battery recycling, gold mining electronic wastes, precious metals. CO2 can also be used in a reverse fuel cell with nafion to make a gas-to-liquids fuel, such as methanol, ethanol and butanol or ethylene. Supercritical CO2 has also been used for treating nafion to make it more effective catalyst. This NFT is for the purchase of worldwide rights which includes the design. More Info
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
Infinity Turbine Products: Special for this month, any plans are $10,000 for complete Cad/Cam blueprints. License is for one build. Try before you buy a production license. May pay by Bitcoin or other Crypto. Products Page... More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)