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Automotive Radial Turbine Expander Design WHR

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Automotive Radial Turbine Expander Design WHR ( automotive-radial-turbine-expander-design-whr )

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24 Figure ‎2-3: (a)Scroll expander [112], (b) Screw expander [113], (c) Piston expander [114] and Rotary Vane expander [115]. Among PDEs, the scroll expander has the most complicated geometry [47]. It can be categorised into two main groups: compliant scroll expanders and cinematically constrained scroll expanders. In the former type, lubrication is compulsory to operate efficiently without causing wear due to the contact of the wrap sidewalls. In the latter category, lubrication is not required due to the existence of the linking mechanism between the orbiting and fixed scrolls. An advantage of the cinematically constrained scroll expanders is that they do not require inlet and exhaust valves; therefore, noise is reduced and the durability of the device is increased [77]. However, sealing is required to prevent internal leakage. In screw expanders, lubrication is required due to the direct contact between the two lobes. Given the high rotational speed of screw expanders, reduction gear boxes and speed control equipment might be required [47]. When a dry fluid is used as the working fluid in ORC systems, seals are required, which increases the machine cost significantly[116]. Unlike piston expanders, both scroll and screw expanders can work with wet fluids without damaging the devices because they can generally accept large liquid mass fractions[117].

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