Editing Combustor (section)

===History===
Advancements in combustor technology focused on several distinct areas; emissions, operating range, and durability. Early jet engines produced large amounts of smoke, so early combustor advances, in the 1950s, were aimed at reducing the smoke produced by the engine. Once smoke was essentially eliminated, efforts turned in the 1970s to reducing other emissions, like [[unburned hydrocarbon]]s and [[carbon monoxide]] (for more details, see the ''Emissions'' section below). The 1970s also saw improvement in combustor durability, as new manufacturing methods improved liner (see ''Components'' below) lifetime by nearly 100 times that of early liners. In the 1980s combustors began to improve their efficiency across the whole operating range; combustors tended to be highly efficient (99%+) at full power, but that efficiency dropped off at lower settings. Development over that decade improved efficiencies at lower levels. The 1990s and 2000s saw a renewed focus on reducing emissions, particularly [[nitrogen oxides]]. Combustor technology is still being actively researched and advanced, and much modern research focuses on improving the same aspects.<ref>{{cite journal |author=Koff, Bernard L. |title=Gas Turbine Technology Evolution: A Designer's Perspective. |journal=[[Journal of Propulsion and Power]] |volume=20 |number=4 |date=July–August 2004 |pages=577–595 |doi=10.2514/1.4361 |url=https://arc.aiaa.org/doi/10.2514/1.4361|url-access=subscription }}</ref>