Investigation of a High-Speed Duct Flow With Fast Pressure Sensitive Paint

2022 ◽  
Author(s):  
Andrew N. Bustard ◽  
Tatsunori Hayashi ◽  
Hirotaka Sakaue ◽  
Thomas J. Juliano
Keyword(s):  
High Speed ◽  
Pressure Sensitive Paint ◽  
Duct Flow ◽  
Pressure Sensitive

Study of Film Cooling Effectiveness on a Double-Walled Effusion-Cooled Turbine Blade in a High-Speed Flow Using Pressure Sensitive Paint

2019 ◽  
Author(s):  
Gladys C. Ngetich ◽  
Peter T. Ireland ◽  
Eduardo Romero
Keyword(s):  
Turbine Blade ◽  
Film Cooling ◽  
High Speed ◽  
High Porosity ◽  
Pressure Sensitive Paint ◽  
Blade Surface ◽  
Cooling Effectiveness ◽  
Film Cooling Effectiveness ◽  
Pressure Sensitive ◽  
Double Wall

Abstract A detailed analysis of film cooling performance on a double-walled effusion-cooled blade is essential for both the coolant consumption optimization and assessment of the film to offer the desired levels of the turbine blade protection. Yet there are hardly any film effectiveness studies on double-wall full-coverage film cooled turbine blades. This paper presents a detailed film cooling effectiveness study over the full surface of a double-walled effusion-cooled high-pressure turbine rotor blade using Pressure Sensitive Paint (PSP). PSP permitted a non-intrusive and conduction-errors-free means of obtaining clean and distinct local distribution of film effectiveness on the blade surface making it possible to extract valuable film cooling effectiveness performance data on the whole blade surface. Three large-scale circular pedestal double-wall blade designs with varying pedestal height, pedestal diameter and cooling hole diameter were tested in a high-speed stationary single-blade linear cascade running at engine-representative Mach and Reynolds numbers. All the blades were tested within a range of representative modern engine coolant mass flow, ṁc to mainstream, ṁg ratios; 1.6% < ṁc/ṁ∞ < 5.5%. High porosity blade exhibited a better flow distribution and was found to consistently perform the best.

Study of Film Cooling in the Trailing Edge Region of a Turbine Rotor Blade in High Speed Flow Using Pressure Sensitive Paint

2016 ◽  
Author(s):  
Niharika Gurram ◽  
Peter T. Ireland ◽  
Tsun Holt Wong ◽  
Kevin P. Self
Keyword(s):  
Film Cooling ◽  
Rotor Blade ◽  
High Speed ◽  
Turbine Rotor ◽  
Edge Region ◽  
Pressure Sensitive Paint ◽  
Trailing Edge ◽  
Turbine Rotor Blade ◽  
Blowing Ratio ◽  
Pressure Sensitive

This research focuses on film cooling of the trailing edge of a scaled up turbine rotor blade with engine-representative Mach number distribution. Pressure sensitive paint was used to obtain high-resolution adiabatic film cooling effectiveness measurements in the trailing edge region of the scaled turbine blade. The large scale, high-speed experimental set-up consists of a Perspex test section for maximum visibility of the PSP coated blade. The test section was designed to recreate a single blade passage of a gas turbine with inlet Mach and Reynolds numbers matching the corresponding values in an engine. The test blade has a constant cross section, representative of the mid-span profile of the high pressure turbine rotor blade. It was manufactured from aluminium to minimize temperature gradients over the surface of the test blade. In the current research, pressure surface cooling slots at the trailing edge were examined and the effect of cutback surface protuberance, or ‘land’, shapes on trailing edge film cooling was studied. Nitrogen and air were used as coolant gases giving a coolant to mainstream density ratio close to 1. Two land geometries-straight and tapered-were studied for a set of 6 blowing ratios from 0.4 to 1.4 in steps of 0.2. Land taper has a benefit for film cooling near the slot exit but its advantage reduces close to the trailing edge. For both geometries, film effectiveness falls with blowing ratio from 0.4 to 0.8 and increases with blowing ratio in the 0.8 to 1.4 range. Crossflow causes the coolant film to be biased towards one side of the lands. Film effectiveness results are compared with data from a scaled up low speed flat plat model of the trailing edge to explain the effect of acceleration on film cooling.

scholarly journals Pressure-Sensitive Paint Measurements in High-Speed Wind Tunnels

2014 ◽  
Vol 34 (132) ◽  
pp. 9-15
Author(s):  
Kazuyuki NAKAKITA ◽  
Mitsuru KURITA ◽  
Masaharu KAMEDA
Keyword(s):  
High Speed ◽  
Wind Tunnels ◽  
Pressure Sensitive Paint ◽  
Pressure Sensitive

scholarly journals PSP Measurement of Stator Vane Surface Pressures in a High Speed Fan

1998 ◽  
Author(s):  
Jan Lepicovsky
Keyword(s):  
High Speed ◽  
Suction Side ◽  
Lessons Learned ◽  
Operating Conditions ◽  
Meridional Plane ◽  
Pressure Sensitive Paint ◽  
Pressure Sensitive ◽  
Calibration Methods ◽  
Stator Vane ◽  
Recorded Image

This paper presents measurements of static pressures on the stator vane suction side of a high-speed single stage fan using the technique of pressure sensitive paint (PSP). The paper illustrates development in application of the relatively new experimental technique to the complex environment of internal flows in turbomachines. First, there is a short explanation of the physics of the PSP technique and a discussion of calibration methods for pressure sensitive paint in the turbomachinery environment. A description of the image conversion process follows. The recorded image of the stator vane pressure field is skewed due to the limited optical access and must be converted to the meridional plane projection for comparison with analytical predictions. The experimental results for seven operating conditions along an off-design rotational speed line are shown in a concise form, including performance map points, midspan static tap pressure distributions, and vane suction side pressure fields. Then, a comparison between static tap and pressure sensitive paint data is discussed. Finally, the paper lists shortcomings of the pressure sensitive paint technology and lessons learned in this high-speed fan application.

scholarly journals Pressure-Sensitive Paint Measurement of Flow around High-Speed Trains with Different Tail Shapes

2007 ◽  
Vol 27 (Supplement1) ◽  
pp. 13-16
Author(s):  
Takeyuki KODERA ◽  
Taro YAMASHITA ◽  
Keisuke ASAI ◽  
Hiroki NAGAI ◽  
Kiyoshi MORITA
Keyword(s):  
High Speed ◽  
Pressure Sensitive Paint ◽  
Pressure Sensitive ◽  
High Speed Trains

A review of pressure-sensitive paint for high-speed and unsteady aerodynamics

2008 ◽  
Vol 222 (2) ◽  
pp. 249-290 ◽  
Author(s):  
J W Gregory ◽  
K Asai ◽  
M Kameda ◽  
T Liu ◽  
J P Sullivan
Keyword(s):  
High Speed ◽  
Response Times ◽  
Delta Wing ◽  
Unsteady Aerodynamics ◽  
Gas Diffusion ◽  
Current Paper ◽  
Step Response ◽  
Pressure Sensitive Paint ◽  
Pressure Sensitive ◽  
Wide Range

The current paper describes the development of pressure-sensitive paint (PSP) technology as an advanced measurement technique for unsteady flow fields and short-duration wind tunnels. Newly developed paint formulations have step response times approaching 1 μs, making them suitable for a wide range of unsteady testing. Developments in binder technology are discussed, which have resulted in new binder formulations such as anodized aluminium, thin-layer chromatography plate, polymer/ceramic, and poly(TMSP) PSP. The current paper also details modeling work done to describe the gas diffusion properties within the paint binder and understand the limitations of the paint response characteristics. Various dynamic calibration techniques for PSP are discussed, along with summaries of typical response times. A review of unsteady and high-speed PSP applications is presented, including experiments with shock tubes, hypersonic tunnels, unsteady delta wing aerodynamics, fluidic oscillator flows, Hartmann tube oscillations, acoustics, and turbomachinery. Flowfields with fundamental frequencies as high as 21 kHz have been successfully measured with porous PSP formulations.

Discussion on Luminescent Intensity of Pressure Sensitive Paint

2007 ◽  
Author(s):  
Hiroki Yamaguchi ◽  
Yu Matsuda ◽  
Hideo Mori ◽  
Tomohide Niimi
Keyword(s):  
Knudsen Number ◽  
Surface Pressure ◽  
Luminescence Intensity ◽  
High Speed ◽  
Local Equilibrium ◽  
Mean Free Path ◽  
Flow Fields ◽  
Small Scale ◽  
Pressure Sensitive Paint ◽  
Pressure Sensitive

The Pressure Sensitive Paint (PSP) is very useful and easy way to obtain the pressure distribution on surfaces. Therefore the PSP has been adopted to various flow fields to obtain pressure distributions, showing good agreement with other methods, such as a pressure tap. Many kinds of flow fields have been used in the manufacturing process, like small scale, low pressure and/or high speed flows; for example, semiconductor manufacturing processes where a mean free path of gas molecules is large, and micro-/nano-systems where a characteristic length is small. Recently the PSP is applied to these high Knudsen number flows. Usually it is considered that the luminescent of the PSP represents the surface pressure, but it is not clear yet that this “pressure” means “static” or “total” pressure. The PSP is considered to be in the boundary layer, leading to the local equilibrium of oxygen molecular density between in the gas phase and in the PSP is achieved. This becomes a large problem especially in the high Knudsen number regime. The mechanism of the PSP has been mainly discussed focused on the luminescence intensity and the oxygen quenching of luminescent molecules. Here, in this study, we tried to relate the flux of oxygen molecules and the surface pressure to the luminescence intensity of the PSP, and clarify the limit of application from the molecular kinetics point of view. The main target of this problem was in the high Knudsen number and the high Mach number flow fields.

Sign in / Sign up

Export Citation Format

Share Document