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EXPERIMENTAL STUDY ON THE INLET FOGGING SYSTEM USING TWO-FLUID NOZZLE
Abhilash Suryan,김동선(D. S. Kim),김부정(B. J. Kim),김희동(Heuy-Dong Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Large-capacity compressors in industrial plants as well as gas turbine engines consume a considerable amount of power. The compression work is a strong function of the ambient air temperature, with work increasing by 0.8 percent to 1.0 percent for every 1 ℃ rise in ambient temperature. This increase in compression work presents a significant problem to utilities, generators and power producers when electric demands are high during the hot months. In many petrochemical process industries and gas turbine engines, the increase in compression work curtails plant output, demanding more electric power to drive the system. One way to counter this problem is to directly cool the inlet air. In the present study, experiments have been performed to investigate the suitability of two-fluid nozzle for inlet fogging. Compressed air is used as a driving working gas for two-fluid nozzle and water at ambient conditions is dragged into the high-speed air jet, thus enabling the entrained water to be atomized in a very short distance from the exit of the two-fluid nozzle. The air supply pressure is varied between 2.0 and 5.0 bars and the water flow rate entrained is measured. The flow visualization and temperature measurement are carried out to specify the fogging characteristics of the two-fluid nozzle.
GSV Measurements of Fog Sprays from Impaction Pin Nozzles
Abhilash Suryan,Jung Keun Lee(이중근),Chang Ki Kim(김창기),Dong Sun Kim(김동선),Heuy Dong Kim(김희동) 한국가시화정보학회 2010 한국가시화정보학회 학술발표대회 논문집 Vol.2010 No.11
Impaction pin nozzles are widely used in a large number of engineering applications. For inlet air cooling of turbo machines using fog sprays, it is essential to have prior knowledge of droplet size distribution in the spray. Present paper reports the experimental determination of droplet size distribution of the fog spray from an impaction pin nozzle. The measurements were carried out using global sizing velocimetry technique. Results obtained are in good agreement with available data.
Abhilash Suryan,Dong-Sun Kim(김동선),Hae-Dong Lee(이해동),Joon-Kyeong Kwon(권준경),Heuy-Dong Kim(김희동) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The ever increasing demand for power and the shortages encountered during summer calls for the implementation of strategies for power saving in industry. Inlet fogging of gas turbine engines is quite popular due to the ease of installation and the relatively low initial cost compared to other inlet cooling methods. In the present investigation, a detailed analysis is carried out on the basis of coincident wet bulb and dry bulb temperature data of a compressed air plant from April to October, 2007 to determine the evaporative cooling potential for the period. The power gain that can be obtained by employing inlet fogging of the air compressors is analyzed based on the real climatic data at several sites in Korea. An experimental set-up was constructed and tests were carried out with the standard impaction pin nozzle. The experimental results were found to match with the theoretical calculations.
EXPERIMENTAL STUDY ON THE IMPACTION PIN NOZZLE FOR INLET FOGGING
Abhilash Suryan,김동선(D. S. Kim),오상민(S. M. Oh),김희동(Heuy-Dong Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The compression work is a strong function of the ambient air temperature. Increase in compression work thus presents a significant problem to utilities, generators and power producers when electric demands are high during the hot summer months. In many petrochemical and process industries and gas turbine power plants, this increase in compression work results in considerable increase in the power requirements to drive the compressor. One way to counter this problem is to directly cool the inlet air. Inlet fogging is a popular means of cooling the inlet air to air compressors. In the present study, experiments have been performed to investigate the suitability of impaction pin nozzle for inlet fogging. The supply pressure is varied between 140bar G and 210 bar G and the water flow rate is measured for each case. The flow visualization and temperature measurement are carried out to specify the fogging characteristics and the rate of evaporation of the droplets from the impaction pin nozzle.
PIV를 이용한 스파이럴 노즐에서의 아음속 기체유동 계측
Abhilash Suryan,Vincent Lijo,김희동(Heuy-Dong Kim),김동선(Dong-Sun Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Swirling flow, in general, needs a compulsive force to get the tangential momentum in the nozzle. But the Spiral Nozzles do not require any extra device to generate this swirl. The special geometry of the nozzle facilitates a self generating mechanism for the spiral flow in the spiral nozzles. In the present investigation velocity measurements are carried out on the subsonic gas flow through Spiral Nozzles with different geometries for the annular slit using Particle Image Velocimetry technique. Velocity measurements were carried out at two sections in the spiral flow field and the flow characteristics were compared for the different nozzle configurations.
Exergy Analysis of Inlet Fogging System for Turbomachinery Power Savings
Abhilash Suryan,Jung Keun Lee(이중근),Chang Ki Kim(김창기),Hai Yeong Jeong(정해영),Heuy Dong Kim(김희동) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Exergy is defined as the energy that is available to provide useful work. Exergy analysis is performed in industries to use energy more efficiently. Application of the exergy concept in describing various heating and cooling systems enables us to have a better picture of the systems. Inlet fogging is an evaporative cooling technique for turbo machinery. In this paper energy and exergy analysis is made on the inlet fogging system employed in the inlet air cooling of turbo machines. Different ambient conditions are considered in the analysis.
Measurement of Droplet Distributions in Inlet Fogging Systems using Global Sizing Velocimetry
Chang Ki Kim(김창기),Abhilash Suryan,Jung Keun Lee(이중근),Hai Yeong Jeong(정해영),Heuy Dong Kim(김희동) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.4
Inlet fogging is a popular ar inlet air cooling technique for turbo machines. Impaction pin nozzles are widely used in a large number of inlet fogging installations. For inlet air cooling using fog sprays, it is essential to have prior knowledge of droplet size distribution in the spray. Present paper reports the experimental determination of droplet size distribution of the fog spray from an impaction pin nozzle. The measurements were carried out using global sizing velocimetry technique. Results obtained are in good agreement with available data.
초음속 공동내부의 압력진동 제어에 미치는 기류 마하수의 영향
신춘식(Choon Sik Shin),Abhilash Suryan,김희동(Heuy Dong Kim) 한국추진공학회 2009 한국추진공학회 학술대회논문집 Vol.2009 No.5
본 연구에서는 2차원 초음속 공동유동에서 발생하는 압력진동을 제어하기 위하여 수치해석적 연구를 수행하였다. 본 계산에서는 압력진동을 제어하기 위하여 보조공동의 형상을 변화시켰으며, 유동의 마하수를 1.50, 1.83 그리고 2.50로 변화시켰다. 그 결과, 보조공동은 압력진동을 상당히 감소시켰으며, 압력진동의 제어효과는 유동의 마하수와 보조공동의 상세형상에 크게 의존함을 알았다. Numerical computations were carried out to analyze the effect of inlet Mach number and sub-cavity on the control of cavity-induced pressure oscillations in two-dimensional supersonic flow. A passive control method wherein a sub-cavity was introduced on the front wall of a square cavity was studied for Mach numbers 1.50, 1.83 and 2.50. The results showed that sub-cavity is effective in reducing the oscillations at different inlet Mach numbers. The resultant amount of attenuation of pressure oscillations depended on the inlet Mach number, length of the flat plate, and the depth of the sub-cavity used as an oscillation suppressor.
A Fundamental Study on Droplet Evaporation in Wet Compression Systems
Abhay Mohan,Palani Kumar Chidambaram,Abhilash Suryan,Heuy Dong Kim(김희동) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
For the current investigation, the gas liquid two-phase media are modeled as air involving fine droplet or droplets of water. A cylinder-piston system is modeled which contains air with single or multiple droplets of water. The compression process is achieved by the movement of the piston. During the compression process, thermodynamic properties such as temperature and pressure are investigated in detail. Analytical equations have been derived to obtain the transformation in fluid properties. The results thus obtained are discussed for different conditions of overspray and initial absolute humidity of the air inside the cylinder. The thermodynamic curves obtained are seen to deviate significantly from the dry isentropic curve ( PVγ=constant) with decreasing droplet diameters and increasing mass of droplets. This deviation can be associated with the latent heat absorbed by the evaporating droplets during the process of compression.