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Keywords: Mach number
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Journal Articles
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041018.
Published Online: July 25, 2011
...Vladimir Vassiliev; Stefan Irmisch; Samer Abdel-Wahab; Andrey Granovskiy The flow in exhaust diffusers along with the channel geometry strongly depends on the inflow conditions, including Mach number level, total pressure distribution, flow angle, and turbulence. In the first part of this paper...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041012.
Published Online: July 21, 2011
... to evaluate the effects of blade loading, backsweep angle, and relative velocity diffusion ratio on compressor performance. The design suction flow coefficient was 0.125 and the machine Mach number was 0.87. Test results showed that the developed impeller achieved 3.8% higher stage efficiency and 11% larger...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041011.
Published Online: July 21, 2011
... parameters, including inlet Mach number, inlet distortion, wave number, diffuser outlet-to-inlet radius ratio, diffuser width to inlet radius ratio, and impeller backswept angle, on the rotating waves are presented. It was found that inlet spanwise distortion of radial velocity has little effects on diffuser...
Journal Articles
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041004.
Published Online: July 19, 2011
... found in the high pressure turbine blades of heavy-duty gas turbines. Numerical studies and experimental investigations in a linear cascade have been conducted at a blade exit isentropic Mach number of 0.8 and a Reynolds number of 9 × 10 5 . The influence of the coolant flow ejected from the tip dust...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031006.
Published Online: July 14, 2011
... film-cooling holes on the suction side (45 deg compound), 4 rows on the pressure side (45 deg compound) and 3 around the leading edge (30 deg radial). The inlet and the exit Mach numbers are 0.24 and 0.44, respectively. The Reynolds number of the mainstream flow is 7.5 × 10 5 based on the exit velocity...
Journal Articles
Article Type: Research Papers
J. Turbomach. January 2012, 134(1): 011020.
Published Online: May 31, 2011
.... In this paper, experiments using a linear turbine blade cascade with high aerodynamic loading are presented. The blade pitch is increased such that at design conditions, a strong separation occurs on the suction side. The experiments were run at high subsonic exit Mach numbers and at Reynolds numbers of 390,000...
Journal Articles
Article Type: Research Papers
J. Turbomach. January 2012, 134(1): 011004.
Published Online: May 24, 2011
... turbines used for power generation. An optimal target blowing ratio is defined for each film hole row, and tests are performed for 100%, 150%, and 200% of this target value. Tests are performed for inlet Mach numbers of 0.36 and 0.45 with corresponding exit Mach numbers of 0.51 and 0.68, respectively...
Journal Articles
Article Type: Research Papers
J. Turbomach. October 2011, 133(4): 041027.
Published Online: April 27, 2011
... is supersonic for all three tip gaps investigated. Mach numbers within the tip gap become lower as the tip gap decreases. For the flow regions near the leading edge of the tip gap, surface Nusselt numbers decrease as the tip gap decreases. Opposite trends are observed for the trailing edge region. Several “hot...
Journal Articles
Article Type: Research Papers
J. Turbomach. October 2011, 133(4): 041026.
Published Online: April 26, 2011
... data at discrete locations on the blade tip. 29 06 2010 28 07 2010 26 04 2011 26 04 2011 computational fluid dynamics engines heat transfer infrared imaging Mach number Aerodynamic loss for the typical tip designs has been extensively studied for both rotating...
Journal Articles
Article Type: Research Papers
J. Turbomach. October 2011, 133(4): 041025.
Published Online: April 26, 2011
... and low speed cascades. The results show that at engine representative Mach numbers, the tip flow is predominantly transonic. Thus, compared with the low speed tip flow, the heat transfer is affected by reductions in both the heat-transfer coefficient and the recovery temperature. The high Mach numbers...
Journal Articles
Article Type: Research Papers
J. Turbomach. October 2011, 133(4): 041001.
Published Online: April 19, 2011
... are conducted using the Rolls-Royce HYDRA/PADRAM suite. The CFD solver is able to capture most of the spatial heat flux variations and gives prediction results, which compare well with the experimental data. The results show that the majority of the blade tip experiences a supersonic flow with peak Mach number...
Journal Articles
Article Type: Research Papers
J. Turbomach. October 2011, 133(4): 041004.
Published Online: April 19, 2011
... are presented as a function of a coating nonuniformity parameter. Results are presented over a range of negative and positive incidences and inlet Mach numbers from 0.6 to 0.8. A map is provided that shows the allowable degree of coating nonuniformity as a function of incidence and inlet Mach number. Tuck...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2011, 133(3): 031017.
Published Online: November 18, 2010
... the authors’ websites. The design system can be used to design multistage compressors and turbines from a small number of physical design parameters. Students can understand the connection between these physical parameters such as the Mach number and flow angles to the cross sectional area and angular...
Journal Articles
Journal Articles
Article Type: Research Papers
J. Turbomach. April 2011, 133(2): 021004.
Published Online: October 19, 2010
... performance. The design suction flow coefficient was 0.125 and the machine Mach number was 0.87. Test results showed that the compressor stage efficiency was increased by 5% compared with the base design without reducing the pressure coefficient and surge margin. It was concluded that an increased relative...
Journal Articles
Journal Articles
Article Type: Research Papers
J. Turbomach. October 2010, 132(4): 041008.
Published Online: April 29, 2010
..., was the estimation of overall efficiency of the cooled region. Experimental measurements were carried out imposing two different crossflow Mach numbers, 0.15 and 0.40, and varying blowing ratio from 0.5 to 1.7; effectiveness of the cooled surface was evaluated with a steady-state technique, using thermochromic...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2010, 132(3): 031020.
Published Online: April 7, 2010
... distributions of total pressure loss coefficient, local normalized exit Mach number, and local normalized exit kinetic energy. Integrated aerodynamic losses ( I A L ) increase anywhere from 4% to 45% compared with a smooth blade with no film injection. The performance of each hole type depends on the airfoil...