Browsing by Author "Anand, S."

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Aerodynamic behaviour of a linear subsonic compressor cascade in a droplet laden flow
(2018) Narayanan, D.; Anand, S.; Anish, S.
In the present investigation a computational study of droplet laden flow in a linear compressor cascade has been carried out. Simulations have been carried out at different incidence angles in order to understand the effect of water droplets in the separated flow regions. The study reveals significant flow modifications in the separated flow region by the presence of water droplets and the total loss coefficient reduces at the downstream side of the compressor significantly at positive incidence angles. Particular emphasis has been given to study the effect of water injection on the blade loading and analyze pressure distribution over the blade at negative and positive incidence angles. It has been noted that pressure distribution over blade is almost uniform at higher incidence angles. At smaller incidence angles the blade suction side pressure values are non-uniform in the axial direction due to the increased droplet wall interactions. As a result, the pressure contours are highly non-uniform in the suction surface. On the contrary at higher incidence angles a smoother pressure contours are observed at the suction side. � 2018 by the authors of the abstracts.
Aerodynamic behaviour of a linear subsonic compressor cascade in a droplet laden flow
(Dalian University of Technology, 2018) Narayanan, D.; Anand, S.; Anish, S.
In the present investigation a computational study of droplet laden flow in a linear compressor cascade has been carried out. Simulations have been carried out at different incidence angles in order to understand the effect of water droplets in the separated flow regions. The study reveals significant flow modifications in the separated flow region by the presence of water droplets and the total loss coefficient reduces at the downstream side of the compressor significantly at positive incidence angles. Particular emphasis has been given to study the effect of water injection on the blade loading and analyze pressure distribution over the blade at negative and positive incidence angles. It has been noted that pressure distribution over blade is almost uniform at higher incidence angles. At smaller incidence angles the blade suction side pressure values are non-uniform in the axial direction due to the increased droplet wall interactions. As a result, the pressure contours are highly non-uniform in the suction surface. On the contrary at higher incidence angles a smoother pressure contours are observed at the suction side. Â© 2018 by the authors of the abstracts.
Investigation of Water Rivulets Formation on the Pressure Side of a Linear Compressor Cascade Under Wet Compression
(Springer, 2024) Narayanan, D.; Anand, S.; Anish, S.
The interactivity of the droplets with the surface of the blade is of paramount importance for understanding the physical mechanism of wet compression. Investigation of the formation of water rivulets over the compressor blades at various incidence angles is discussed in this paper. By injecting fine water droplets into a compressor cascade, numerical and experimental investigations have been carried out to study the formation of water rivulet and its propagation. The study has been carried out at various incidence angles. Through flow visualization, the wall rivulet formation over the blade surface is analyzed. Accumulation of water droplets over the blade surface is found to be less at a higher impact angle where the droplets disintegration is more. Shear forces arising from the neighboring flow drive the wall film toward the trailing edge, forming small rivulets. The amount of deposited water decreases with the increase in water droplet velocity. © The Institution of Engineers (India) 2022.
Numerical investigation on the effect of dry and wet compression on a linear low speed compressor cascade
(Isfahan University of Technology secretary@jafmonline.net, 2020) Narayanan, D.; Anand, S.; Anish, S.
Several techniques are implemented to reduce the temperature rise in multistage compressors, which leads to the noticeable improvement in specific power output of a gas turbine. The objective of the present investigation intends to understand the effect of incidence angles on the aerodynamic performance of the compressor cascade under wet compression. Using large eddy simulations (LES) the effects of wet compression on compressor flow separation and wake formation are investigated. Experimental investigation was performed to validate the numerical results. The study reveals notable flow modifications in the separated flow region under the influence of wet compression and the total loss coefficient reduces significantly at the downstream side of the compressor for positive incidence angles. On the other hand, for negative incidence angles the wet compression enhances the total pressure losses inside the blade passage. Also, in the present investigation, particular emphasis has been given to understand the water film formation at negative and positive incidence angles. © Isfahan University of Technology.