As explained above, the compression ratio of spark
ignition engines is limited to avoid knocking and this
implies a thermodynamic limit for efficiency. Looking for
means past this limit, concepts for enabling diesel-like
combustion with hydrogen were investigated. If combustion
with very late direct injection of hydrogen was
possible, the risk of knock could be removed and thus the
compression ratio raised. However, in order to benefit
from an increase in efficiency, heat losses of the flame to
the cylinder walls must be minimized at the same time, as
otherwise they would more than compensate for the
benefit of the raised compression and could even lead to a
loss of efficiency [37]. It is possible to counter this risk by
means of appropriate combustion chamber and injector
geometry design. Fig. 10 shows a H2 single cylinder
research engine, which was developed for a Diesel-like
combustion system for a hydrogen ICE.
As explained above, the compression ratio of spark
ignition engines is limited to avoid knocking and this
implies a thermodynamic limit for efficiency. Looking for
means past this limit, concepts for enabling diesel-like
combustion with hydrogen were investigated. If combustion
with very late direct injection of hydrogen was
possible, the risk of knock could be removed and thus the
compression ratio raised. However, in order to benefit
from an increase in efficiency, heat losses of the flame to
the cylinder walls must be minimized at the same time, as
otherwise they would more than compensate for the
benefit of the raised compression and could even lead to a
loss of efficiency [37]. It is possible to counter this risk by
means of appropriate combustion chamber and injector
geometry design. Fig. 10 shows a H2 single cylinder
research engine, which was developed for a Diesel-like
combustion system for a hydrogen ICE.
การแปล กรุณารอสักครู่..
As explained above, the compression ratio of spark
ignition engines is limited to avoid knocking and this
implies a thermodynamic limit for efficiency. Looking for
means past this limit, concepts for enabling diesel-like
combustion with hydrogen were investigated. If combustion
with very late direct injection of hydrogen was
possible, the risk of knock could be removed and thus the
compression ratio raised. However, in order to benefit
from an increase in efficiency, heat losses of the flame to
the cylinder walls must be minimized at the same time, as
otherwise they would more than compensate for the
benefit of the raised compression and could even lead to a
loss of efficiency [37]. It is possible to counter this risk by
means of appropriate combustion chamber and injector
geometry design. Fig. 10 shows a H2 single cylinder
research engine, which was developed for a Diesel-like
combustion system for a hydrogen ICE.
การแปล กรุณารอสักครู่..