Analysis of a scroll machine for micro ORC applications by means of a RE/CFD methodology

CFD modelling of small scale ORC scroll expanders using variable wall thicknesses

“…Their work contained an experimental validation. The unstructured mesh approach has also been used by other researchers [12,24,33]. The mesh report in Table 2 shows the number of nodes and cells for each domain of the computational grid for two variable wall thickness scroll expanders with radial clearances of 200 µm and 75 µm respectively.…”

“…CFD simulations of scroll machines have been increasingly conducted in recent years for investigation of the inner working process [12,[23][24][25][26][27][28]. The understanding developed has contributed to performance predictions which are useful for preliminary design and the further improvement of the scroll geometry itself.…”

“…The understanding developed has contributed to performance predictions which are useful for preliminary design and the further improvement of the scroll geometry itself. A few researchers examined their scroll machines with the help of a 2D CFD approach [23,24]. In comparison to a 3D CFD model, the 2D CFD model of Chang et al (2014) [12] revealed a similar prediction of the pressure and volume change during the expander working process with a small deviation during the expansion process.…”

Pressure Pulsation and Cavitation Phenomena in a Micro-ORC System

“…The simulation strategy is based on a dynamic mesh approach, able to take into account the rotation and the engagement of the wheels, as well as the transient phenomena that affect the entire ORC. The dynamic mesh approach has been proven to be suitable for the analysis of such a machine, for discovering cavitation issues [17,18] and for calculating the performance [19,20].…”

Estratégia para simulação CFD de um expansor scroll

“…Condições de contorno para simulação como (a) compressor e (b) expansor Fonte: Autor "adaptado de"Morini et al, 2015 Figura 31 -Pressão de saída e campos de pressão durante a revolução Fonte: Autor "adaptado de"Morini et al, 2015 Figura 32 -Vazamento de flanco no expansor Fonte: Morini et al, 2015 O diferencial do trabalho de PP Song et al (2013) é a captura do vazamento de flanco e do vazamento de topo. Embora outros trabalhos tenham apresentado o vazamento de flanco, nenhum apresentou resultados com o vazamento de topo.…”