But the combustion temperature decrease when the amount of rare-earth is more than 2.0%.

当混合轻稀土含量大于2.0%时，起燃点开始下降。

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When the equivalence ratio of the premixed flow is exactly stoichiometric, the combustion temperature reaches the highest.

预混气流的当量比为化学恰当比时，燃烧温度最高；

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The effects of the combustion temperature and combustion atmosphere on the release of bromine and iodine were investigated.

结果表明：溴、碘的释放程度随燃烧温度升高而增加，随燃烧气氛中氧气浓度的增加而降低。

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One is exhaust gas recirculation, which pumps cooled exhaust back into the engine air intake, lowering the combustion temperature and reducing NOx formation.

FORBES: Clearing the Air