Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 54 for “"Turbocharger"”.
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An experimental investigation of turbocharger stall
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982.
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Oil-whirl instability in an automotive turbocharger
… into the nonlinear dynamic behaviour of a turbocharger. Specifically the instabilities due to oil-whirl are examined. These are self-excited vibrations existing in the form of an in-phase whirl mode and a conical whirl mode. Waterfall plots were provided by Cummins Turbo-Technologies Ltd., …
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Dynamic Performance of Turbocharger Rotor-Bearing Systems
… were to design and construct a high speed turbocharger test rig (TTR) to measure dynamics of differing turbocharger rotor bearing systems and to develop a coupled rotor-cartridge model for the ball bearing rotor system to corroborate the experimental and analytical results. The ball bearing …
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Flow Analysis of Vibration Modes in Turbocharger Turbines
… end, we conduct computational flow analysis of a turbocharger turbine with 13 rotor blades and 14 stator blades for precomputed time-dependent blade deformation patterns. The flow analysis is carried out for the rotor vibration modes corresponding to a set of natural frequencies lower than but …
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Design of an automobile turbocharger gas turbine engine
The turbocharger gas turbine engine was designed with the intent of being built as a demonstration for the Massachusetts Institute of Technology Department of Mechanical Engineering courses 2.005 and 2.006 to supplement material covered. A gas turbine operates on an open version of the Brayton …
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Development of a MEMS turbocharger and gas turbine engine
… describes the development and testing of a MEMS turbocharger. This is a version of a simple cycle, single spool gas turbine engine with compressor and turbine flow paths separated for diagnostic purposes, intended for turbomachinery and rotordynamic development. The turbocharger design described …
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Prediction of natural frequencies of turbine blades for turbocharger application. An investigation of the finite element method, mathematical modelling and frequency survey methods applied to turbocharger blade vibration in order to predict natural frequencies of turbocharger blades.
… A new nomenclature for the mode shapes of a turbocharger’s blade was proposed, designed and demonstrated to allow direct identification of associated mode shape. It is concluded that Finite Element Analysis combined with the frequency survey is capable of predicting changes in turbine natural …
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Stability Analysis of a Turbocharger for Marine Diesel Engine Service
… critical in high-speed machinery such as turbochargers. Large turbochargers, such as those found in marine diesel propulsion engines where the rotor alone often exceeds forty pounds, require careful consideration regarding stability as well as load support during the bearing selection …
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Dynamic Stability Evaluation of an Automotive Turbocharger Rotor-Bearing System
… the dynamic stability of an automotive turbocharger rotor-bearing system using both linear and nonlinear analyses. The capabilities of a commercial Finite Element Analysis (FEA) code (computer program) were implemented in the investigation process. Several different hydrodynamic journal …
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After treatment and turbocharger effects on emissions of a diesel engine
… study on the effects of after treatments and a turbocharger on emissions of a single cylinder diesel engine. The study measured the concentration of CO, CO2, HC, NO, NO2, and NOx. Tests on the engine were performed at different engine loads and engine speeds. The engine power ranged from 0 to 9 …
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Fluid mechanics of ported shroud centrifugal compressor for vehicular turbocharger applications
… (PS) self-recirculating casing treatment used in turbocharger centrifugal compressors for increasing the operable range. Computed results, assessed with experimental measurements on ported and non-ported variants of a representative turbocharger compressor, are used to determine the impact of the …
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Evaluation of Alternate Bearing Designs in a High Speed Automotive Turbocharger
Automotive turbochargers experience self-excited instabilities through the majority of their operating speed range. The results of these instabilities can cause damage to the bearings, shafts, and housing walls. Preventing this damage while maintaining or increasing performance characteristics is a …
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Influence of Induced Unbalance on Subsynchronous Vibrations of an Automotive Turbocharger
… instability is present in most or all automotive turbochargers. High subsynchronous amplitudes can cause a variety of problems in areas such as mechanical failures, emissions regulations and rotor design. Self-excited vibrations from sources of damping can lock in at lateral natural frequencies …
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Synchronous Thermal Instability Evaluation of Medium Speed Turbocharger Rotor-Bearing Systems
… development of the Morton Effect in medium-speed turbochargers typical to shipboard propulsion engines and the effect that bearing clearance has on thermal stability. Floating ring and tilting pad journal bearings are considered with a single stage, overhung centrifugal compressor and an overhung …
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Design and performance of a gas-turbine engine from an automobile turbocharger
… classes. The engine was built from an automobile turbocharger with a combustion chamber connected between its compressor and turbine. Pressure and temperature sensors at different points of the engine cycle allow students to monitor the performance of the individual engine components and the …
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Design, fabrication, and performance of a gas-turbine engine from an automobile turbocharger
… gas-turbine engine is made from an automobile turbocharger for its common shaft turbine and compressor. A combustion chamber was placed between the outlet of the compressor and the inlet of the turbine. The temperature measurement system was designed from the placement of thermocouples on the …
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Design of an axial turbine and thermodynamic analysis and testing of a K03 turbocharger
… was through the selection and testing of a car turbocharger. The design of a turbine is given in detail and follows the process given in "Design of High- Efficiency Turbomachinery and Gas Turbines" by David Wilson. The final design of the turbine blades was sand cast. Due to the sand casting …
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Turbocharger Turbines: An Experimental Study on the Effects of Wastegate Size and Flow Passage Design
… investigates three different automotive turbochargers of varying turbine/wastegate combination: two of similar turbine housing (BorgWarner) but different bypass throat diameter (20 and 26 mm), and a third of both different housing (Honeywell) and throat size from the former two (21 mm). …
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A Study of Methods for Improving the Dynamic Stability of High-Speed Turbochargers
The turbocharger industry is booming recently, and there is an urgent need for new evaluations of the overall design. As the oil prices continue to rise, along with the new emissions regulations strictly enforced for the in-road as well as the off-road vehicles, the transition to turbocharged …
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