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Radial inflow turbine design for waste heat recovery systems used in spark ignition engines

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  1. Tez No: 718390
  2. Yazar: ALPEREN KÜÇÜKÖZKAN
  3. Danışmanlar: Belirtilmemiş.
  4. Tez Türü: Yüksek Lisans
  5. Konular: Makine Mühendisliği, Mekatronik Mühendisliği, Mechanical Engineering, Mechatronics Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2020
  8. Dil: İngilizce
  9. Üniversite: The Unıversıty Of Manchester
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: Belirtilmemiş.

Özet

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Özet (Çeviri)

Waste Heat Recovery (WHR) systems are widely used in various applications such as internal combustion engines and power plants to make use of the excess heat, dumped by main application, to generate power. Moreover, it also decreases pollutant gas emissions significantly such as carbon dioxide which causes average temperature increase on the Earth. As a result, utilization of this energy is quite important in terms of energy production and environment. Various WHR methods such as Thermoacoustic, Thermoelectric generation and Organic Rankine Cycle (ORC), can be used to produce power for different applications. Yet, due to non-commercialization of Thermoacoustics and lack of power density in the Thermoelectric generation, it is impractical to use them in the vehicles. On the other hand, Organic Rankine Cycle provides good amount of heat recovery for low to medium temperature heat sources. In addition to those, choosing and design of the expander machine in the ORC plays a vital role in terms of the efficiency of the cycle. The aim of this thesis is to obtain an efficient single stage Radial Inflow Turbine design that can be used for ORC systems used in Spark Ignition engines, unlike the ones designed for the HeavyDuty Diesel engine applications. To fulfil this aim, 1-D Mean Line method is used to end up with a turbine geometry with different performance parameters by using a specific organic fluid (R245fa). Moreover, off-design conditions are investigated to observe how good the turbine performs under different conditions Unfortunately, due to lack of experimental data for ORC applications in Spark Ignition engine, the proposed methodology is only validated with 3-D Computational Fluid Dynamics (CFD) analysis. Mean line analysis shows that, optimum turbine produces 8.87 kW with 61.75% isentropic efficiency. Moreover, turbine has a total size of 54.09 mm, which is the indication of a compact design. CFD analysis also shows agreement with the mean line design in terms of losses and parameters variations, yet some discrepancies are observed.

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