Abstract
Presently the on-the-road transportation sector is responsible of the 21% of the whole CO2 amount emitted into atmosphere. This pushes the International Governments and Organizations to provide strict limitations in terms of ICEs emissions, also introducing fees payment for the car manufacturers. The vehicle electrification allows certainly to meet these requirements, but the higher cost and the need of a green electricity still limit a widespread diffusion among all social classes. Thus, the technological improvement of internal combustion engine plays a key role in the transition period. Among these technologies, the engine thermal management allows to achieve a good compromise between the CO2 emission reduction and related costs. It was demonstrated that replacing the conventional centrifugal pump of engine cooling system with a sliding vane rotary pump (SVRP), important benefits in terms of CO2 emission reduction can be achieved as centrifugal pump efficiency decreases significantly when the engine works far from the maximum load (i.e. design point of the pump). Nevertheless, the complex thermo-fluid-dynamic phenomena taking place inside a SVRP make its design not immediate, particularly if heavy duty ICE cooling systems are considered. These applications indeed are challenging due to the wide operating range and the huge flow rates which pump must deliver. These operating requirements make difficult the choice of the main design parameters: among the different ones, the pump revolution speed and displaced volume. In the present paper a design strategy is developed for this type of pumps based on a comprehensive mathematical model of the processes occurring, predicting volumetric, indicated and mechanical efficiencies. The model was validated with a wide experimental activity so acting as virtual development platform. The results show how the best global efficiency (0.59) is achieved adopting a dual axial intake port configuration, with a suitable choice result of a trade-off between displaced volume and revolution speed. The analysis also show that the pump keeps its efficiency close to the design one for a wide operating range which is particularly suitable for the cooling of an ICE.
Highlights
Technological advancements in the on-the-road transportation sector are needed to meet the targets imposed on harmful species and CO2
Major advantages are represented by the possibility to decouple the pump from the engine shaft allowing a more intelligent thermal management based on the engine thermal needs
The results show as the best efficiency is achieved with LSDAP (Case D), adopting the lower revolution speed LS solution with the dual axial port configuration DAP (Figure 2(b)) In this case the global efficiency in correspondence of the design point is equal to 0.58 thanks to a high indicated efficiency (0.85) and an acceptable mechanical performance (0.72)
Summary
Technological advancements in the on-the-road transportation sector are needed to meet the targets imposed on harmful species and CO2. The main drawback is represented by volumetric and mechanical losses, caused by the contact between moving parts For these reasons, their use has been limited to the engine lubricating circuits, where the oil can prevent the wear of the moving parts. Their use has been limited to the engine lubricating circuits, where the oil can prevent the wear of the moving parts In these applications, variable displacement vane pumps have been frequently studied to avoid the use of a relief valve when the engine operating conditions determine an excessive flowrate of oil. Variable displacement vane pumps have been frequently studied to avoid the use of a relief valve when the engine operating conditions determine an excessive flowrate of oil This kind of systems allows a reduction of the flowrate which determines an increase of the fuel economy [9]. A different approach has been used in [18], where a deterministic model has been built which was able to reproduce the flowrate of a variable displacement vane pump with an accuracy between 1% and 7 % depending on its rotational speed
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