Influence of Upstream Pulsed Energy Addition on Shock-Wave Structure in Supersonic Flow

2002 ◽  
Author(s):  
Syed Zaidi ◽  
Michael Shneider ◽  
D. Mansfield ◽  
Yuri Ionikh ◽  
Richard Miles
Keyword(s):  
Shock Wave ◽  
Supersonic Flow ◽  
Wave Structure ◽  
Shock Wave Structure ◽  
Energy Addition

Using a Bowed Blade to Improve the Supersonic Flow Performance in the Nozzle of a Supersonic Industrial Steam Turbine

2017 ◽  
Vol 139 (10) ◽  
Author(s):  
Hong Yao ◽  
Xun Zhou ◽  
Zhongqi Wang
Keyword(s):  
Shock Wave ◽  
Supersonic Flow ◽  
Steam Turbine ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Wave Structure ◽  
Shock Wave Structure ◽  
Waste Energy ◽  
Low Mass

For solar plants, waste-energy recovery, and turbogenerators, there is a considerable amount of waste energy due to low mass flow rate. Owing to the high specific power output and large pressure ratios across the turbine, a supersonic industrial steam turbine (IST) is able to utilize the waste energy associated with low mass flow rate. Supersonic IST has fewer stages than conventional turbines and a compact and modular design, thus avoiding the excessive size and manufacturing cost of conventional IST. Given their flexible operation and ability to function with loads in the range of 50–120% of the design load, supersonic IST offers significant advantages compared to conventional IST. The strong shock-wave loss caused by supersonic flows can be reduced by decreasing the shock intensity and reducing its influence; consequently, a supersonic IST can reach higher efficiency levels. Considering the demonstrated utility of bowed blades in conventional IST, this paper presents a study of the use of bowed blades in a supersonic IST. For this purpose, first, the shock-wave structure in the supersonic flow field was analyzed and compared with experimental results. Then, four different bowed blades were designed and compared with a straight blade to study the influence of bowed blades on the shock-wave structure and wetness. The results indicate that S-shaped bowing can improve the efficiency of supersonic turbines, and the energy-loss coefficient of the stators can be decreased by 2.4% or more under various operating conditions.

Overtip Shock Wave Structure and Its Impact on Turbine Blade Tip Heat Transfer

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
Q. Zhang ◽  
D. O. O’Dowd ◽  
L. He ◽  
A. P. S. Wheeler ◽  
P. M. Ligrani ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Shock Wave ◽  
High Pressure ◽  
Supersonic Flow ◽  
Turbine Blade ◽  
High Speed ◽  
Wave Structure ◽  
Shock Wave Structure ◽  
High Pressure Turbine ◽  
Blade Tip

In this paper, the transonic flow pattern and its influence on heat transfer on a high-pressure turbine blade tip are investigated using experimental and computational methods. Spatially resolved heat transfer data are obtained at conditions representative of a single-stage high-pressure turbine blade (Mexit=1.0, Reexit=1.27×106, gap=1.5% chord) using the transient infrared thermography technique within the Oxford high speed linear cascade research facility. Computational fluid dynamics (CFD) predictions 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 reaching 1.8. Unlike other low-speed data in the open literature, the turbine blade tip heat transfer is greatly influenced by the shock wave structure inside the tip gap. Oblique shock waves are initiated near the pressure-side edge of the tip, prior to being reflected multiple times between the casing and the tip. Supersonic flow within the tip gap is generally terminated by a normal shock near the exit of the gap. Both measured and calculated heat transfer spatial distributions illustrate very clear stripes as the signature of the multiple shock structure. Overall, the supersonic part of tip experiences noticeably lower heat transfer than that near the leading-edge where the flow inside the tip gap remains subsonic.

scholarly journals Nematic Dispersive Shock Waves from Nonlocal to Local

2021 ◽  
Vol 11 (11) ◽  
pp. 4736
Author(s):  
Saleh Baqer ◽  
Dimitrios J. Frantzeskakis ◽  
Theodoros P. Horikis ◽  
Côme Houdeville ◽  
Timothy R. Marchant ◽  
...  
Keyword(s):  
Shock Wave ◽  
Liquid Crystals ◽  
Shock Waves ◽  
Numerical Solutions ◽  
Wave Structure ◽  
Beam Power ◽  
Input Beam ◽  
Shock Wave Structure ◽  
Wave Solutions ◽  
Modulation Theory

The structure of optical dispersive shock waves in nematic liquid crystals is investigated as the power of the optical beam is varied, with six regimes identified, which complements previous work pertinent to low power beams only. It is found that the dispersive shock wave structure depends critically on the input beam power. In addition, it is known that nematic dispersive shock waves are resonant and the structure of this resonance is also critically dependent on the beam power. Whitham modulation theory is used to find solutions for the six regimes with the existence intervals for each identified. These dispersive shock wave solutions are compared with full numerical solutions of the nematic equations, and excellent agreement is found.

The double shock wave structure in the solar wind

1967 ◽  
Vol 72 (21) ◽  
pp. 5275-5286 ◽  
Author(s):  
G. Schubert ◽  
W. D. Cummings
Keyword(s):  
Shock Wave ◽  
Solar Wind ◽  
Wave Structure ◽  
Shock Wave Structure

Shock wave structure in nonlinear dielectrics

1976 ◽  
Vol 10 (1) ◽  
pp. 237-240 ◽  
Author(s):  
Rolf Landauer
Keyword(s):  
Shock Wave ◽  
Wave Structure ◽  
Shock Wave Structure

Shock-wave structure formation by nanosecond discharge in helium

2014 ◽  
Vol 40 (6) ◽  
pp. 533-536 ◽  
Author(s):  
I. A. Znamenskaya ◽  
I. E. Ivanov ◽  
I. A. Kryukov ◽  
I. V. Mursenkova ◽  
M. Yu. Timokhin
Keyword(s):  
Shock Wave ◽  
Structure Formation ◽  
Wave Structure ◽  
Nanosecond Discharge ◽  
Shock Wave Structure
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