Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

A Study of the Fluidic Characteristics of High-Pressure Fuel Pumps for GDI Engines

GDI 고압펌프의 유동특성에 관한 연구

  • Received : 2014.08.04
  • Accepted : 2015.02.16
  • Published : 2015.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

A high-pressure fuel pump is a key component in a gasoline direct injection (GDI) engine; thus, understanding its flow characteristics is essential for improving the engine power and fuel efficiency. In this study, AMESim, which is a hydraulic analysis program, was used to analyze the performance of the high-pressure fuel pump. However, since AMESim uses a one-dimensional model for the system analysis, it does not accurately analyze the complicated flow characteristics. Thus, Fluent, computational fluid dynamics (CFD) software, was used to calculate the flow rates and net forces at the intake and discharge ports of the high-pressure fuel pump where turbulent flow occurs. The CFD analysis results for various pressure conditions and valve lifts were used as look-up tables for the AMEsim model. The CFD analysis results complemented the AMEsim results, and thus, improved the accuracy of the performance analysis results for the high-pressure fuel pump.

고압연료펌프는 GDI 엔진의 핵심 구성요소로써, 엔진출력 및 연료 효율을 향상시키기 위해서는 고압연료펌프의 유동특성을 연구하는 것이 필요하다. 본 연구에서는 유압해석툴인 AMEsim을 이용하여 고압연료펌프의 통합 모델을 생성하여 유동해석을 수행하였다. 하지만, AMEsim은 시스템 해석을 위한 1차원 모델이므로 복잡한 유동현상이 발생하는 부근에서의 해석 결과는 정확하지 않은 단점이 있으므로 본 연구에서는 전산해석프로그램인 Fluent를 이용하여 난류유동이 발생하는 체크밸브의 흡입부와 토출부에서 유량과 알짜힘을 계산하였다. 다양한 압력조건과 밸브 간극변화에 따른 CFD 해석 결과는 AMEsim모델에 대한 룩업테이블로 사용되어 AMEsim의 결과를 보완함으로써 고압연료펌프에 대한 성능 분석결과의 정확성을 향상시키는 결과를 얻을 수 있었다.

Keywords

References

  1. Hwang, J. S., Heo, H. S., Lee, D. H., Shin, W. Y. and Hwang, J. K., 2011, "Analysis of Valves for Design of a High Pressure Fuel Pump for GDI Engine," KSAE Conference Proceedings, pp. 347-352.
  2. Seo, D. H., Shin, W. G., Moon, H. S. and Lee, J. H., 2012, "The HALT Test on the Spill Valve Controller Considering the Operating Characteristics of GDI Fuel Pump," proceeding of KSME, pp. 976-980.
  3. Na, B. C. and Kim, B. S., 1998, "A Study on Performance Improvements of High Pressure Fuel Pump for GDI Engine," proceeding of KSME, pp. 464-469.
  4. Jang, J. S. and Yoon, Y. H., 2008, "Analysis Model Development of Fuel Injection System for CRDI Engines," KSAE 30th Anniversary Conference 2008, pp. 468-474.
  5. Yoon, Y. H., 2005, "Introduction to AMESim Software," Korean Soc Fluid Power Constr Equip Vol.2 No1, pp. 3-9.
  6. Lim, B. S. and Ahn, S. J., 2010, "NVH Development of the High Pressure Fuel System for GDI Engines," 2010.11, KSAE Conference Proceedings , pp. 468-474.
  7. Jang, J. S., Koh, H. S., Han, S. Y. and Lee, K. W., 2011, "Analysis of Dynamic Characteristics and Performances of Vent-Relief Valve," Journal of the Korean Society of Propulsion Engineers, pp. 70-77.
  8. Lee, C. T., 2013, "A Study on the Performance Characteristic of Common Rail High Pressure Pump," 2013-17-6. Journal of the Korea society for power system engineering, pp. 5-10. https://doi.org/10.9726/kspse.2013.17.6.005
  9. Park, H. J., Bae, S. J. and Heo, H. S., 2012, "An Analytical Study of Dynamic Flow Characteristics of a High Pressure Fuel Pump for Gasoline Direct Injection Engine," KSAE
  10. Spegar, T. D., Chang, S. and Das, S., 2009, "An Analytical and Experimental Study of High Pressure Single Piston Pump for Gasoline Direct Injection (GDI) Engine Applications," SAE International, 2009-01-1504.