Covering the basics through advanced operation of spark-ignition and diesel engines.
Written by one of the most recognized and highly regarded names in internal combustion engines this trusted educational resource and professional reference covers the key physical and chemical processes that gov...
SPECIALE MOTOREN
1. Stirling motor :
= hete luchtmotor door Rob Stirling in 1816
- arbeidsfluïdum in gesloten kring (vb. helium)
- werkingsprincipe
- verbrandingsproducten buiten motor
- ideale thermodynamische kringloop horende bij ideaal
werkingsprincipe
rendement cyclus = rendement CARNOT
(zijnde hoogste rendement te verwezenlijken voor
arbeidscyclus tussen uiterste temperaturen T1 en T2)
dQ = dU+pdV met V = cte tussen II – III en I – IV
dQ = dU = cv dT met [dT]III
II
= [ dT ]IV
I
[c v ]III
II
= [ c ]IV
v I
is ∫ TdS > onder II − III = ∫ TdS onder I − IV
T2 − T1 T
⇒ ηv = = 1− 1
T2 T2
speciale motor slide 1.
, - ideale (hoekige) cyclus benaderd door rombische
aandrijving
- aandrijving geen traagheidskrachten
- toerental beperkt :
→ om Δp over warmtewisselaars te beperken
→ daarom eveneens ρ << (helium, waterstof)
- energietoevoer van buiten
→ willekeurige brandstof of verwarmingsbron
- vermogenregeling :
meer of minder massa arbeidsfluïdum in omloop
(om variatie snel te laten gebeuren zonder te veel energie
op te slorpen ρ <<)
- kopstuktemperatuur 700 °C
(max. cyclustemperatuur 700 °C i.p.v. 2500 °C bij benzine
of diesel)
- druk 220 bar → afdichtingen
- rolsok afdichting
- radiator 2 x groter dan klassieke zuigermotor
voor automotoren : compacter dubbelwerkend type
zie figuren
speciale motor slide 2.
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