Rotary Vane Expander – Analysis and Prediction of Delayed Chamber Closure

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21720%2F19%3A00333280" target="_blank" >RIV/68407700:21720/19:00333280 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.orc2019.com/online/proceedings/documents/32.pdf" target="_blank" >https://www.orc2019.com/online/proceedings/documents/32.pdf</a>

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Rotary Vane Expander – Analysis and Prediction of Delayed Chamber Closure

Popis výsledku v původním jazyce

Rotary vane expander (RVE) is a perspective solution in the case of requirement for expanders with low power output in range of single kW as they can provide attractive cost to performance ratio, especially in case of small series or single units manufacturing. Specific feature of the RVE are the vanes sliding on the surface of a stator cylinder, thus creating chambers. Permanent contact between the vanes and the stator is essential from the perspective of expander efficiency and lifetime of the vanes. If the vane does not maintain contact with the stator, a phenomenon called vane chatter occurs. In this case, the working chamber is not properly formed, which is associated with excessive leaks of the working fluid from the working chamber. If this occurs during the filling phase, the mass flow of the working fluid through the machine will be greatly increased, while at the same time the overall efficiency of the expander will be reduced.This work provides a mathematical model which extends amodel describing internal leakage pathways by prediction of the occurrence and extent of the delayed closure of the working chamber in the filling phase. The model is based on a combination of 1D isentropicflow of the working fluid through a set of described leakage pathways combined with a dynamic model of vanes, describing their radial position.The model results are after preliminary assessment in agreement with experimental measurements on an in house developed RVE with hexamethyldisiloxane (MM)as working fluid. Vanes of various mass were tested for a given range of rotational speed as the difference in the centrifugal force acting on the vanes has major influence on the proper closure of the working chamber (but also on friction losses).

Název v anglickém jazyce

Rotary Vane Expander – Analysis and Prediction of Delayed Chamber Closure

Popis výsledku anglicky

Rotary vane expander (RVE) is a perspective solution in the case of requirement for expanders with low power output in range of single kW as they can provide attractive cost to performance ratio, especially in case of small series or single units manufacturing. Specific feature of the RVE are the vanes sliding on the surface of a stator cylinder, thus creating chambers. Permanent contact between the vanes and the stator is essential from the perspective of expander efficiency and lifetime of the vanes. If the vane does not maintain contact with the stator, a phenomenon called vane chatter occurs. In this case, the working chamber is not properly formed, which is associated with excessive leaks of the working fluid from the working chamber. If this occurs during the filling phase, the mass flow of the working fluid through the machine will be greatly increased, while at the same time the overall efficiency of the expander will be reduced.This work provides a mathematical model which extends amodel describing internal leakage pathways by prediction of the occurrence and extent of the delayed closure of the working chamber in the filling phase. The model is based on a combination of 1D isentropicflow of the working fluid through a set of described leakage pathways combined with a dynamic model of vanes, describing their radial position.The model results are after preliminary assessment in agreement with experimental measurements on an in house developed RVE with hexamethyldisiloxane (MM)as working fluid. Vanes of various mass were tested for a given range of rotational speed as the difference in the centrifugal force acting on the vanes has major influence on the proper closure of the working chamber (but also on friction losses).

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20704 - Energy and fuels

Projekt

<a href="/cs/project/LO1605" target="_blank" >LO1605: Univerzitní centrum energeticky efektivních budov – Fáze udržitelnosti</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the 5th International Seminar on ORC Power Systems

ISBN

978-90-90-32038-0

ISSN

—

e-ISSN

—

Počet stran výsledku

10

Strana od-do

—

Název nakladatele

National Technical University of Athens

Místo vydání

—

Místo konání akce

Athens

Datum konání akce

9. 9. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—