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Influence of air supply on the performance and internal flow characteristics of a cross flow turbine
Affiliation:1. Graduate School, Department of Mechanical Engineering, Mokpo National University, Muan-gun 530-729, Jeollanam-do, Republic of Korea;2. Department of Mechanical Engineering, Institute of New and Renewable Energy Technology Research, Mokpo National University, Muan-gun 530-729, Jeollanam-do, Republic of Korea;1. Instituto Politécnico Nacional, Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional (CIIDIR), Unidad Sinaloa, Blvd. Juan de Dios Bátiz Paredes No. 250, San Joachín C.P. 81101, Guasave, SIN, Mexico;2. Departamento de Oceanografía Biológica. Centro de Investigación Científica y de Educación Superior de Ensenada, Carretera Ensenada-Tijuana No. 3918, Zona Playitas, C.P. 22860, Ensenada, B.C., Mexico;3. Universidad Autónoma de Baja California, Facultad de Ciencias Marinas, Ensenada, B.C. A.P. 453, Mexico;4. Departamento de Ecología Marina, Centro de Investigación Científica y de Educación Superior de Ensenada, Carretera Ensenada-Tijuana No. 3918, Zona Playitas, C.P. 22860, Ensenada, B.C., Mexico;1. Linné Flow Centre, KTH Mekanik, Osquars Backe 18, SE-10044 Stockholm, Sweden;2. Nordita, Roslagstullsbacken 23, 106 91 Stockholm, Sweden;3. Chemistry, Materials and Chemical Engineering Department ‘Giulio Natta’, Politecnico di Milano, Milano, Italy;1. Mohamed Boudiaf University of M’sila, M’sila 28000, Algeria;2. Mohand Oulhadj University of Bouira, Bouira 10000, Algeria;3. University of Sétif, Sétif 19000, Algeria;4. Faculty of Computers and Information, Benha University, Benha, Egypt;5. School of Engineering and Applied Sciences, Nile University, Giza, Egypt;1. College of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, PR China;2. College of Food and Drug, Anhui Science and Technology University, Fengyang 233100, PR China;3. College of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, PR China
Abstract:This study attempts to improve the efficiency of a given type of cross flow turbine by supplying air from air suction holes. A newly developed air supply method is adopted. CFD analysis of the cross flow turbine is carried out to investigate the performance and internal flow characteristics of the turbine in detail. The air layer prevents shock loss between water flow and axis and suppresses recirculation flow in the runner passage. Hence, it is necessary to measure the amount of air layer in the runner passage and examine its effect on the performance of the cross flow turbine. The result shows that the turbine efficiency has improved more as the newly developed air supply method is applied effectively.
Keywords:Cross flow turbine  Performance improvement  Internal flow  Air layer effect
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