This paper presents the experimental and numerical investigation of an outward volute of rectangular cross section. The investigation is carried out at the level of - stage performance, - volute performance and - detailed flow field study at selected peripheral positions for various operating points. The objective of the investigation was to gain further knowledge about the flow structure and loss mechanism in the volute. Simultaneously with the experimental investigation, a numerical simulation of the flow in the volute was carried out. A 3D Euler-code was used in which a wall friction term and a tuned artificial dissipation term account for viscous effects. A reasonable agreement between the experimental and numerical results is observed. As a result a good and detailed knowledge about the pressure recovery and loss mechanism in the volute is obtained.
The flow in a centrifugal compressor stage is dominated by the geometry of the impeller, the diffuser and the exit collecting chamber. Asymmetries of the flow field in the annular space behind the impeller may create a circumferential pressure distortion, influencing the energy transfer by the impeller in a negative way, creating variable force on the impeller blades and a radial force on the shaft. Experimental investigations of the circumferential static pressure variations have been carried out on a large radial compressor test stand. Measurements with various impellers, diffusers and collecting chambers show the influence of geometrical modifications on the flow and compressor characteristics. It is shown how a concentric exit chamber results in a very large pressure distortion in the diffuser. Although the amplitude of this distortion is increasing towards the diffuser inlet, it has a negligible effect on the pressure distortion upstream of the impeller. It is further shown how the asymmetry of the flow in the diffuser can be reduced either by using a throttling ring at the diffuser exit, a vaned diffuser or by replacing the constant cross section collector by a volute with circumferentially increasing cross section.
This paper presents the experimental and numerical investigation of an outward volute of rectangular cross section. The investigation is carried out at the level of stage performance, volute performance, and detailed flow field study at selected peripheral positions for various operating points. The objective of the investigation was to gain further knowledge about the flow structure and loss mechanism in the volute. Simultaneously with the experimental investigation, a numerical simulation of the flow in the volute was carried out. A three-dimensional Euler code was used in which a wall friction term and a tuned artificial dissipation term account for viscous effects. A reasonable agreement between the experimental and numerical results is observed. As a result a good and detailed knowledge about the pressure recovery and loss mechanism in the volute is obtained. [S0889-504X(00)00301-9]
This paper describes a new model for the analysis of the flow in volutes of centrifugal compressors. It explicitly takes into account the vortical structure of the flow that has been observed during detailed three-dimensional flow measurements. It makes use of an impeller and diffuser response model to predict the nonuniformity of the volute inlet flow due, to the circumferential variation of the pressure at the volute inlet, and is therefore applicable also at off-design operation of the volute. Predicted total pressure loss and static pressure rise coefficients at design and off-design operation have been compared with experimental data for different volute geometries but only one test case is presented here. Good agreement in terms of losses and pressure rise is observed at most operating points and confirms the validity of the impeller and diffuser response model.
swirgen AG, Sldiiig /nlcrriritiorni/ Technologies t t r l . und dcm Frtrirnli,Jfi,r-In.rlitiri jirr Beirii.hsfi,.sti:.keit L 5 F wurden VerdichterrSder iius Aluminiuniund Magnesium-FcinguRlegierungen cntwickclt und untcrsucht. Festigkeits-und Schwingl'estigkeitsuntersuchungen, Schleuder-und Fcldvcrsuchc sowie metallographischc Ilntersuchungcn wurdcn von Finite-Element-Berechnungen bcglcirct, mit dcncn Spannungsverteilungen am Bauteil optimicrt wurdcn. Anhand der ermittelten Ergebnissc sol1 gekllrt werden. inwieweil Magnesium-Feingul3lcgierungen die gegenwiirtig fur Turbolader-Vcrdichtcrr~d~r cingesetzten Alurniniurn-Feingul~legierungcn crsctzcn konnen. Within thc scope of a team work between Kiihnle, Kopp & Kousch AG, Volkswagen A<;, Sterling Internutional Technologies !.ti!. and the Frrtrmhnfer Iiwtitiit~ #i>r Strenglh c?f'Structrrres irnder Operationu1 ('ondition.~ 1.BF cornpressor wheels of aluminium and magncsium investment casting werc dcvcloped and tested. Strength and latiguc tests, ovcrspeed and lield tests as well as metallographic chccks wcre made in addition to the finite element calculations to optimize the stress under centrifugal force in an appropriate way for the materials involved. The results and the knowledge gathered arc to clarify whether magnesium alloys are an appropriatc rcplacement lor the proven standard aluminium alloy for turbochargers. _ _ _ _ i 6X Sonsino, Kaui'mann und Kcipet-Mat.-wiss., u.
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