| Title |
A Study on the Design of an Asymmetric Algebraic Scroll Expander |
| Authors |
김현진(Hyun-Jin Kim) ; 문제현(Je-Hyeon Moon) ; 이영성(Young-Sung Lee) |
| DOI |
http://dx.doi.org/10.6110/KJACR.2014.26.3.122 |
| Keywords |
스크롤 팽창기 ; 대수나선 ; 폐열회수 ; 랭킨 사이클 ; 축출력 Scroll expander ; Algebraic spiral ; Waste heat recovey ; Rankine cycle ; Shaft power |
| Abstract |
In order to extract shaft power from thermal energy in a R134a Rankine cycle as waste heat recovery system of a passenger car, a scroll expander has been designed. Algebraic spiral is adopted as the base curve for scroll wrap profile in the compact scroll design. About 19% reduction in scroll diameter is accomplished when compared to the conventional involute scroll. Performance analysis on the designed scroll expander shows that the expander efficiency is 85.5% at the vehicle speed of 120 km/hr and it decreases to 67.2% at 60 km/hr, provided that the scroll clearance is kept at 10 μm. The expander can produce shaft power equivalent to about 13～14% of the driving power within the speed range of 60 ～120 km/hr. |