Climate change and propulsion technology Climate technology: potential, limitations, difficulties, obstacles – (PPT)

摘要

Evolutionary increases in propulsion efficien Evolutionary efficiency. Increasing thermal efficiency requires increases in both overall pressure ratio and turbine entry temperature: these increase NO_x production. Most large turbofans have specific thrusts around the optimum for fuel burn: reducing specific thrust below this optimum in order to meet noise targets increases fuel burn and CO_2.