Mechanical Analysis of Genoa 03 Stirling Engine
Due to the new technologies development based on renewable sources of energy, in recent years Stirling engines have become very important in the energetic sector. Many of them do not allow the use of fluid lubricants and, thus, the effect of friction losses is important. For this purpose, a mathematical model has been developed based on the force balance in the crankshaft using the pressure distribution in the cylinders. The aim of this work is to characterize the mechanical losses in a Genoa 03 Stirling engine using a numerical model and experimentally via the drag method. The results of this model have been compared with those obtained experimentally on Genoa 03 Stirling engine. In the experimental results, a proportional increase in friction torque due to the average pressure and the speed of the crankshaft is observed. The first of these is caused by an increase of dry friction forces and the second, by the viscous friction between the working fluid and the inner walls of the engine. Also in this paper, irreversible processes in a beta type Stirling engine have been investigated in order to highlight the impact of losses on mechanical power and its performance. This article develops the first study of the mechanical losses of Genoa 03 experimental Stirling engine, which has an output power of 3 kW. Although the model response follows the same trends as the experiments, those simplifications provide errors which become more significant as the engine speed increases.
Stirling injini ni moja ya injini za umeme za zamani zaidi katika ulimwengu wa umeme, na kwa sababu ya maendeleo ya teknolojia mpya kulingana na vyanzo vya nishati mbadala, katika miaka ya hivi karibuni injini za Stirling zimekuwa muhimu sana katika sekta ya nishati. Wengi wao hawaruhusu matumizi ya lubricants kioevu na, hivyo, athari ya hasara msuguano ni muhimu. Kwa kusudi hili, mfano wa hisabati umebuniwa kulingana na usawa wa nguvu katika crankshaft kwa kutumia usambazaji wa shinikizo katika silinda. Lengo la kazi hii ni kuelezea hasara za mitambo katika injini ya Genoa 03 Stirling kwa kutumia mfano wa hesabu na kwa majaribio kupitia njia ya kuvuta. Matokeo ya mfano huu yamepimwa na yale yaliyopatikana kwa majaribio kwenye injini ya Genoa 03 Stirling. Katika matokeo ya majaribio, ongezeko la usawa katika torque friction kutokana na shinikizo la wastani na kasi ya crankshaft ni aliona. Kwanza ni kutokana na kuongezeka kwa nguvu kavu friction, na pili ni kutokana na viscous friction kati ya kazi ya kioevu na kuta ya ndani ya injini. Pia katika karatasi hii, taratibu irreversible katika injini ya aina ya beta Stirling wamekuwa kuchunguzwa ili kuonyesha athari ya hasara juu ya nguvu ya mitambo na utendaji wake. Katika makala hii, tunazungumzia juu ya Genoa 03 Stirling injini ya majaribio, ambayo ina nguvu ya pato ya 3 kW. Ingawa majibu ya mfano ifuatavyo mwenendo sawa na majaribio, wale kurahisisha kutoa makosa ambayo kuwa muhimu zaidi kama kasi ya injini huongezeka.