Journal of Turbomachinery
SCIE-ISI SCOPUS (1986-2023)
0889-504X
1528-8900
Mỹ
Cơ quản chủ quản: ASME , The American Society of Mechanical Engineers(ASME)
Lĩnh vực:
Mechanical Engineering
Các bài báo tiêu biểu
Criteria for Spike Initiated Rotating StallA computational study to define the phenomena that lead to the onset of short length-scale (spike) rotating stall disturbances has been carried out. Based on unsteady simulations, we hypothesize there are two conditions necessary for the formation of spike disturbances, both of which are linked to the tip clearance flow. One is that the interface between the tip clearance and oncoming flow... ...
Tập 130 Số 1 - 2008
Stall, Surge, and 75 Years of ResearchWork on rotating stall and its related disturbances have been in progress since the Second World War. During this period, certain “hot topics” have come to the fore—mostly in response to pressing problems associated with new engine designs. This paper will take a semihistorical look at some of these fields of study (stall, surge, active control, rotating instabilities, etc.) and will exami... ...
Tập 138 Số 1 - 2016
Darryl E. Metzger Memorial Session Paper: Experimental Heat Transfer and Friction in Channels Roughened With Angled, V-Shaped, and Discrete Ribs on Two Opposite WallsExperimental investigations have shown that the enhancement in heat transfer coefficients for air flow in a channel roughened with angled ribs is on the average higher than that roughened with 90 deg ribs of the same geometry. Secondary flows generated by the angled ribs are believed to be responsible for these higher heat transfer coefficients. These secondary flows also create a spanwise... ...
Tập 118 Số 1 - Trang 20-28 - 1996
Film Cooling With Compound Angle Holes: Adiabatic EffectivenessFilm cooling effectiveness was studied experimentally in a flat plate test facility with zero pressure gradient using a single row of inclined holes, which injected high-density, cryogenically cooled air. Round holes and holes with a diffusing expanded exit were directed laterally away from the free-stream direction with a compound angle of 60 deg. Comparisons were made with a baseline cas... ...
Tập 118 Số 4 - Trang 807-813 - 1996
Tip Leakage Flow in Axial CompressorsExperimental measurements in a linear cascade with tip clearance are complemented by numerical solutions of the three-dimensional Navier–Stokes equations in an investigation of tip leakage flow. Measurements reveal that the clearance flow, which separates near the entry of the tip gap, remains unattached for the majority of the blade chord when the tip clearance is similar to that typical ... ...
Tập 113 Số 2 - Trang 252-259 - 1991
The Role of Tip Leakage Vortex Breakdown in Compressor Rotor AerodynamicsThe breakdown of tip leakage vortex has been investigated on a low-speed axial compressor rotor with moderate blade loading. Effects of the breakdown on the rotor aerodynamics are elucidated by Navier–Stokes flow simulations and visualization techniques for identifying the breakdown. The simulations show that the leakage vortex breakdown occurs inside the rotor at a lower flow rate than th... ...
Tập 121 Số 3 - Trang 469-480 - 1999
Adiabatic Wall Effectiveness Measurements of Film-Cooling Holes With Expanded ExitsThis paper presents detailed measurements of the film-cooling effectiveness for three single, scaled-up film-cooling hole geometries. The hole geometries investigated include a cylindrical hole and two holes with a diffuser-shaped exit portion (i.e., a fan-shaped and a laid-back fan-shaped hole). The flow conditions considered are the crossflow Mach number at the hole entrance side (up to ... ...
Tập 120 Số 3 - Trang 549-556 - 1998
Origins and Structure of Spike-Type Rotating StallIn this paper, we describe the structures that produce a spike-type route to rotating stall and explain the physical mechanism for their formation. The descriptions and explanations are based on numerical simulations, complemented and corroborated by experiments. It is found that spikes are caused by a separation at the leading edge due to high incidence. The separation gives rise to shedd... ...
Tập 137 Số 5 - 2015
Three-Dimensional Separations in Axial CompressorsAbstract
Flow separations in the corner regions of blade passages are common. The separations are three dimensional and have quite different properties from the two-dimensional separations that are considered in elementary courses of fluid mechanics. In particular, the consequences for the flow may be less severe than the two-dimensional separation. ... ...
Tập 127 Số 2 - Trang 331-339 - 2005
Role of Blade Passage Flow Structurs in Axial Compressor Rotating Stall InceptionThe influence of three-dimensional flow structures within a compressor blade passage has been examined computationally to determine their role in rotating stall inception. The computations displayed a short length-scale (or spike) type of stall inception similar to that seen in experiments; to the authors’ knowledge this is the first time such a feature has been simulated. A central featur... ...
Tập 121 Số 4 - Trang 735-742 - 1999