Topic
Axial compressor
About: Axial compressor is a research topic. Over the lifetime, 12035 publications have been published within this topic receiving 127766 citations.
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TL;DR: In this article, an axial force model was proposed for predicting cavern diameters in highly shear thinning liquids using axial flow impellers, where the total momentum imparted by the impeller was considered as the sum of both tangential and axial components and assumed a torus-shaped cavern.
98 citations
Patent•
28 Jun 1994
TL;DR: In this paper, an inner and/or outer cylindrical wall limiting the working fluid flow path of an axial compressor radially has an ondulating contour, where at the intersection with the leading edge of an airfoil the wall shows a convex contour followed by a concave contour in the region of the airfoils maximum thickness.
Abstract: An inner and/or outer cylindrical wall limiting the working fluid flow path of an axial compressor radially has an ondulating contour. At the intersection with the leading edge of an airfoil the wall shows a convex contour (54) followed by a concave contour (58) in the region of the airfoils maximum thickness while at the intersection with the trailing edge of the airfoil the contour (56) is convex again. The airfoil can either be a rotor blade or a stator vane.
98 citations
TL;DR: In this article, the evolution and structure of multiple stall cells with short-length-scale in an axial compressor rotor have been investigated experimentally, and a model for the flow mechanism of the short length-scale stall cell has been presented.
Abstract: Evolution and structure of multiple stall cells with short-length-scale in an axial compressor rotor have been investigated experimentally. In a low-speed research compressor rotor tested, a short-length-scale stall cell appeared at first, but did not grow rapidly in size, unlike a so-called spike-type stall inception observed in many multistage compressors. Alternatively, the number of cells increased to a certain stable state (a mild stall state) under a fixed throttle condition. In the mild stall state the multiple stall cells, the size of which was on the same order of the inception cell (a few blade spacings), were rotating at 72 percent of rotor speed and at intervals of 4.8 blade spacings. With further throttling, a long-length-scale wave appeared overlapping the multiple short-length-scale waves, then developed to a deep stall state with a large cell. In order to capture the short-length-scale cells in the mild stall state, a so-called double phase-locked averaging technique has been developed, by which the flow field can be measured phase locked to both the rotor and the stall cell rotation. Then, time-dependent ensemble averages of the three-dimensional velocity components upstream and downstream of the rotor have been obtained with a slanted hot-wire, and the pressure distributions on the casing wall with high-response pressure transducers. By a physically plausible explanation for the experimental results, a model for the flow mechanism of the short-length-scale stall cell has been presented. The distinctive feature of the stall cell structure is on the separation vortex bubble with a leg traveling ahead of the rotor, with changing the blade in turn on which the vortex leg stands.
97 citations
13 Jun 1994
TL;DR: In this paper, a non-axisymmetric hub endwall shape for axial gas turbine NGVs is proposed to improve engine performance by cutting the leakage of coolant from the disc rim seal.
Abstract: The Nozzle Guide Vanes (NGV's) of an axial gas turbine generate circumferential non-uniformities in static pressure after their trailing edges. This paper aims to show that these non- uniformities can be removed locally by re-shaping the hub endwall. The ultimate objective is to improve engine performance by cutting the leakage of coolant from the disc rim seal. The technique is demonstrated theoretically using 3D viscous CFD. The required endwall shape is non-axisymmetric and is generated parametrically by altering a calculation grid for an existing NGV. The results show a reduction of the static pressure non- uniformities by 70%. Other favourable effects are also predicted and are commented upon. NOMENCLATURE
97 citations
Patent•
08 Jul 1994
TL;DR: In this article, a method of controlling the operation of a centrifugal compressor in a water chiller system is presented, where the compressor's capacity is variable by modulating its speed of rotation or by modifying its inlet guide vane's position.
Abstract: A method of controlling the operation of a centrifugal compressor in a water chiller system. The compressor's capacity is variable by modulating its speed of rotation or by modulating its inlet guide vane's position. The water chiller includes an evaporator having a leaving water temperature. The method comprises the steps of: monitoring the leaving water temperature; determining if the leaving water temperature is in a steady state; modulating the compressor capacity by modulating speed of rotation if the leaving water temperature is in a steady state; and modulating the compressor capacity by modulating inlet guide vane position if the leaving water temperature is not in a steady state.
97 citations