증기가 분사된 축류형 터빈의 성능해석에 관한 연구

조수용,김수용,Cho, Soo-Yong,Kim, Soo-Yong 한국유체기계학회 2001 한국유체기계학회 논문집 Vol.4 No.4

Performance analysis is conducted on an axial-type turbine which is used for fire extinction by injecting water or steam into the turbine. Loss models developed by Hacker and Okapuu are applied for predicting the performance of turbine. Pressure loss generated through a turbine is converted to the thermal efficiency, and thermal and gas properties are calculated within a turbine passage. Total-to-total efficiency, total-to-static efficiency, static temperature at the exit of turbine, output power, flow coefficient, blade loading coefficient, and expansion ratio are predicted with changing the amount of injected steam and the rotational speed. The 74 kW class gas turbine developed at KIMM is chosen for performance analysis. The 74 kW class turbine consists of 1 stage like a current developing gas turbine for fire extinction. Water or steam is injected at the end of combustor, and results show that efficiency and output power are dependent on the temperature of injected water or steam and the static temperature at the exit is decreased.

축류형 터빈 익형의 역설계에 의한 최소 형상변수에 관한 연구

조수용,오군섭,윤의수,최범석,Cho, Soo-Yong,Oh, Koon-Sup,Yoon, Eui-Soo,Choi, Bum-Seog 한국유체기계학회 2000 한국유체기계학회 논문집 Vol.3 No.4

Several reverse design methods are developed and applied to the suction or pressure surface for finding design values of blade geometry for a given axial turbine blade. Re-designed blade profiles using shape parameters are compared with measured blade data. Essential shape parameters for blade design are induced by the procedure of reverse design for best fitting. Characteristics of shape parameters are evaluated through the system design method and restriction conditions of structural stability or aerodynamic flow loss. Some of shape parameters i.e blade radius or exit blade angle etc., are classified to weakly adjustable shape parameters, otherwise strongly adjustable shape parameters which would be applied for controlling blade shape. Average deviation values between the measured data and re-designed blade using shape parameters are calculated for each design method. Comparing with the average deviation for a given blade geometry, minimum shape parameters required to design a blade geometry are obtained.

축류송풍기의 설계시 적용된 와류형식의 영향에 관한 실험적 연구

조수용,최범석,오종학,Cho, Soo-Yong,Choi, Bum-Seog,Oh, Jong-Hak 한국유체기계학회 1999 한국유체기계학회 논문집 Vol.2 No.3

The flow angle at the inlet and exit of a rotor or stator is an important design parameter involved in the design a fan blade. Flow angles along the radial direction for 3-D stacking are calculated using two kinds of vortex methods, i.e. free vortex method and forced vortex method. The performance test shows that a fan designed by the free vortex method is more efficient than a fan designed by the forced vortex method. As a reference, an imported fan is tested. Even though the straightner of the imported fan is used for the comparison test, the difference of efficiency between the imported fan and the fan designed by the free vortex method is negligible. The noise of the fan designed by the free vortex method is less than that of the imported fan. A bellmouth installed at the fan inlet improved the fan efficiency more than $10\%$.

축류형 터빈 익형의 역설계 및 형상설계를 위한 설계변수에 관한 연구

조수용,오군섭,최범석,Cho, Soo-Yong,Oh, Koon-Sup,Choi, Bum-Seog 한국유체기계학회 2000 한국유체기계학회 논문집 Vol.3 No.2

For a given axial turbine blade, reverse design method is developed to improve blade efficiency, optimize blade profile, or repair parts etc. In this process, design parameters for designing axial turbine blade are induced. The induced design parameters are as follows; ellipse at leading edge, radios of trailing edge, axial chord, tangential chord, wedge angle at the inlet, and unguided turning angle. Suction and pressure surfaces of turbine blade are described by cubic polynomials. Two sample blades we chosen and their blade profiles are measured at the mean radius. Values of design parameters for sample blades are obtained by the reverse design method. Re-designed blade profiles using calculated design parameters are compared with the measured data, and they show good agreement. So, the developed design method could be applied to design general turbine blades. Various blade shapes are designed, and they show that designed blade profiles can be adjusted by controlling design parameters.

풍력타워의 효율적인 설계변수에 대한 실험적 연구

조수용(Soo-Yong Cho),최상규(Sang-Kyu Choi),김진균(Jin-Gyun Kim),조종현(Chong-Hyun Cho) 한국항공우주학회 2018 한국항공우주학회지 Vol.46 No.2

풍력타워는 수직형 풍력터빈의 성능을 향상하기 위하여 사용되어진다. 하지만 풍력타워의 성능은 내부반경, 외부반경, 안내벽의 개수 등의 설계변수에 의하여 좌우된다. 따라서 본 연구에서는 풍력타워의 효율적인 설계변수를 찾기 위하여 실험적인 연구를 수행하였다. 실험에 사용된 풍동의 시험부는 높이 2 m, 폭 2.2 m이며, 7개의 안내벽을 가진 풍력타워의 한 층을 모델로 제작하고, 그 내부에 풍력터빈을 설치하였다. 다양한 설계변수에 대하여 실험을 하기 위하여 세 가지 종류의 안내벽을 사용하였다. 상대적인 성능평가를 위하여 동일한 입구속도에서 풍력타워를 원주방향으로 회전이동하여 출력계수를 측정하였다. 실험의 결과에서 풍력타워의 내부반경과 풍력터빈의 회전반경과의 간격이 풍력터빈의 성능을 향상 하는데 가장 큰 영향을 미치는 변수임을 보였다. Wind power tower (WPT) has been used to augment the performance of vertical axis wind turbine (VAWT). However, the performance of the WPT depends on several design parameters, such as inner and outer radius, or number of guide walls. Therefore, an experimental study was conducted to investigate efficient design parameters on the WPT. A wind tunnel was utilized and its test section dimension was 2m height and 2.2m width. One story model of the WPT was manufactured with seven guide walls and a VAWT was installed within the WPT. Three different sizes of guide walls were applied to test with various design parameters. The power coefficients were measured along the azimuthal direction in a state of equal inlet velocity in order to compare its performance relatively. The experimental results showed that the gap between the inner radius of the WPT and the rotating radius of the VAWT was a major parameter to improve the performance of VAWT within the WPT.

유기랭킨사이클 작동과 관련한 부품개선에 의한 사이클 효율변화에 대한 영향

조수용(Soo-Yong Cho),조종현(Chong-Hyun Cho) 한국유체기계학회 2016 한국유체기계학회 논문집 Vol.19 No.6

가변 열원에서 작동하기 위한 유기랭킨 사이클에 관한 연구

조수용(Soo-Yong Cho),조종현(Chong-Hyun Cho) 한국유체기계학회 2014 한국유체기계학회 논문집 Vol.17 No.1

원심압축기 최적 임펠러 형상설계에 관한 연구

조수용(Soo-Yong Cho),이영덕(Young-Duk Lee),안국영(Kook-Young Ahn),김영철(Young-Cheol Kim) 한국유체기계학회 2013 한국유체기계학회 논문집 Vol.16 No.1

디젤엔진발전기세트 보호장치 내부에서의 열유동해석

조수용(Soo-Yong Cho),조종현(Chong-Hyun Cho) 한국동력기계공학회 2023 동력시스템공학회지 Vol.27 No.1

A stand-by diesel engine generator has been used in an environment in which the electric power on grid cannot be utilized. Enclosure is installed to protect the diesel engine generator. However, the enclosure causes heat accumulation due to power generation. Hence, the enclosure should be designed so that the temperature does not exceed the required temperature. In this paper, a study was conducted for the design of the enclosure of the 150 kW class emergency power generator set. Based on the 4 intakes and 1 exhaust, it was investigated using a numerical analysis whether the generated heat is discharged by a radiator fan or not, and the role of the intakes and exhaust was figure out. The current designed generator set showed that the temperature inside the enclosure can be maintained below 330 K.

평균반경해석에 의한 7 MW급 증기터빈의 탈설계 성능해석

조수용(Soo-Yong, Cho),최범석(Bum-Seog Choi),임형수(Hyung-Soo Lim) 한국동력기계공학회 2020 동력시스템공학회지 Vol.24 No.2

Steam turbines have been used for various applications. The published data for the performance analysis of steam turbine are very limited due to the exclusive policy between leading manufactures even though it has been used since the nineteenth century. Therefore, a study was conducted to predict the performance of steam turbine at off-design points. A meanline analysis method was developed, which was validated on a used steam turbine. The compared results showed that they were quite well agreed. In addition, it was applied to a designed 7 MW class steam turbine of ten stages for obtaining the performance at off-design points. The comparable result at design point was well agreed, and the performance at off-design points showed that the output power of the turbine was quite sensitive for the varied mass flow rate and temperature at turbine inlet. The output power was decreased by 12.7% for a 10% decrease of mass flow rate, and it was also decreased by 8% for a 10% decrease of temperature at inlet.