Off-Design Sound Emission of Low-Pressure Axial Fans Under Distorted Inflow Conditions: An Experimental Study

2019 ◽  
Vol 105 (1) ◽  
pp. 95-108 ◽  
Author(s):  
Florian J. Krömer ◽  
Stefan Becker
Keyword(s):  
Experimental Study ◽  
Low Pressure ◽  
Sound Emission ◽  
Axial Fans ◽  
Inflow Conditions

Experimental study on saturated boiling of two phase natural circulation under low pressure in narrow rectangular channels

Kerntechnik ◽  
2017 ◽  
Vol 82 (6) ◽  
pp. 631-636
Author(s):  
Li Zi-chao ◽  
Qi Shi ◽  
Zhou Tao ◽  
Li Bing ◽  
Muhammad Ali Shahzad ◽  
...  
Keyword(s):  
Experimental Study ◽  
Natural Circulation ◽  
Low Pressure ◽  
Two Phase ◽  
Rectangular Channels ◽  
Saturated Boiling

Experimental study of large-scale fire behavior under low pressure at high altitude

2013 ◽  
Vol 31 (6) ◽  
pp. 481-494 ◽  
Author(s):  
Wei Yao ◽  
Xiaokang Hu ◽  
Jianzhong Rong ◽  
Jian Wang ◽  
Hui Zhang
Keyword(s):  
Experimental Study ◽  
High Altitude ◽  
Large Scale ◽  
Fire Behavior ◽  
Low Pressure

Experimental Study on the Effect of Clocking on the Propagation of Inflow Pressure Distortions in a Low Pressure Turbine Stage

2020 ◽  
Author(s):  
L. Simonassi ◽  
M. Zenz ◽  
P. Bruckner ◽  
S. Pramstrahler ◽  
F. Heitmeir ◽  
...  
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
Total Pressure ◽  
Low Pressure ◽  
Vibration Characteristics ◽  
Test Facility ◽  
Turbine Stage ◽  
Rotor Vibration ◽  
Low Pressure Turbine ◽  
The Impact

Abstract The design of modern aero engines enhances the interaction between components and facilitates the propagation of circumferential distortions of total pressure and temperature. As a consequence, the inlet conditions of a real turbine have significant spatial non-uniformities, which have direct consequences on both its aerodynamic and vibration characteristics. This work presents the results of an experimental study on the effects of different inlet total pressure distortion-stator clocking positions on the propagation of total pressure inflow disturbances through a low pressure turbine stage, with a particular focus on both the aerodynamic and aeroelastic performance. Measurements at a stable engine relevant operating condition and during transient operation were carried out in a one and a half stage subsonic turbine test facility at the Institute of Thermal Turbomachinery and Machine Dynamics at Graz University of Technology. A localised total pressure distortion was generated upstream of the stage in three different azimuthal positions relative to the stator vanes. The locations were chosen in order to align the distortion directly with a vane leading edge, suction side and pressure side. Additionally, a setup with clean inflow was used as reference. Steady and unsteady aerodynamic measurements were taken downstream of the investigated stage by means of a five-hole-probe (5HP) and a fast response aerodynamic pressure probe (FRAPP) respectively. Strain gauges applied on different blades were used in combination with a telemetry system to acquire the rotor vibration data. The aerodynamic interactions between the stator and rotor rows and the circumferential perturbation were studied through the identification of the main structures constituting the flow field. This showed that the steady and unsteady alterations created by the distortion in the flow field lead to modifications of the rotor vibration characteristics. Moreover, the importance of the impact that the pressure distortion azimuthal position has on the LPT stage aerodynamics and vibrations was highlighted.

Experimental Study of the Low-Pressure Water Jet Assisted Laser Processing of W6Mo5Cr4V2 High-Speed Steel

Applied laser ◽  
2013 ◽  
Vol 33 (2) ◽  
pp. 181-185
Author(s):  
王金华 Wang Jinhua ◽  
袁根福 Yuan Genfu ◽  
逄志伟 Pang Zhiwei ◽  
陈春映 Chen Chunying
Keyword(s):  
Experimental Study ◽  
Laser Processing ◽  
High Speed ◽  
High Speed Steel ◽  
Low Pressure ◽  
Water Jet ◽  
Pressure Water

Experimental study on spectra of femtosecond-laser-induced low-pressure Ni plasma

2014 ◽  
Vol 26 (5) ◽  
pp. 52006
Author(s):  
孙少华 Sun Shaohua ◽  
刘小亮 Liu Xiaoliang ◽  
孙铭泽 Sun Mingze ◽  
曹瑜 Cao Yu ◽  
史彦超 Shi Yanchao ◽  
...  
Keyword(s):  
Experimental Study ◽  
Femtosecond Laser ◽  
Low Pressure
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