| 摘要: | 本計畫針對前瞻高壓高溫高紊流強度貧油預混燃燒科技，提出以奈秒重覆脈衝放電(nanosecond repetitively pulsed discharge, NRPD)之定量引燃量測研究。近年來，在常壓常溫層流和具平均流速等流場之非平衡態電漿輔助NRPD引燃研究已有重要突破，證實NRPD在適當脈衝重覆頻率(pulse repetitive frequency, PRF)下，可產生累積加乘引燃效應，有效提高引燃機率並擴展貧油可燃極限，使超貧油(ultra-lean)燃燒具可行性。雖然超貧油燃燒是一高效率和低NOx之潔淨燃燒技術，不過目前文獻仍尚無NRPD於高壓高溫高紊流強度條件下之實驗結果。如何使NRPD可在高壓高溫高紊流強度條件下安全穩定地操作，為目前國際預混紊流燃燒領域的重要挑戰之一。是故，本三年期計畫，將使用已建立之大型高壓高溫高紊流雙腔室預混燃燒設備，開發具前瞻性之NRPD引燃和燃燒技術，擬定量量測氫氣、合成氣、甲烷、丙烷、丁烷、汽油主要參考燃氣（異辛烷和正庚烷為主）等多種氣態和液態燃料之最小引燃能量、超貧油可燃極限、層紊焰燃燒速度以及燃燒後生成物之NOx濃度等重要參數資訊。本計畫應具學術和應用之價值，將對燃氣輪機與航空/車用引擎效率提升和降低NOx以及節能減碳有所助益，預期目標為產出領先國際相關研究之成果，發表於Combustion and Flame和Proceedings of the Combustion Institute。 ;This proposal is a quantitative ignition measurement research of advanced high-pressure, high-temperature, high-turbulent intensity lean premixed turbulent combustion using nanosecond repetitively pulsed discharges (NRPD). In recent years, under either laminar flow or flows with mean velocities at normal pressure and temperature conditions (1 atm and 298 K), non-equilibrium plasma-assisted NRPD ignition studies had significant progresses. These results substantiated the feasibility of the ultra-lean combustion, provided that an appropriate pulse repetitive frequency (PRF) could be synchronized with the characteristic recirculation frequency of the initial toroidal kernel to generate a cumulatively synergistic ignition effect which could effectively increase ignition probability and extend the lean flammability. Even though the ultra-lean combustion has been recognized as a high-efficiency and low NOx clean combustion technology, there is still no available NRPD experimental results under high-pressure, high-temperature, high-turbulent intensity conditions in literatures. How to develop a robust NRPD ignition device that can be safely and stably used in high-pressure, high-temperature, high-turbulent intensity environment is one of the major challenges for the international combustion community. Hence, this three-year proposal is to develop an advanced NRPD ignition and combustion technology based on an already-established large high-pressure, high-temperature, high-turbulent intensity, double-chamber premixed combustion facility. We plan to measure minimum ignition energies of various gaseous and liquid fuels (i.e. hydrogen, syngas, methane, propane, butane, gasoline primary reference fuel (mainly iso-octane and n-heptane), ultra-lean flammability limits, laminar and turbulent burning velocities, and NOx emissions of burned products. This proposal should be of both academic and applied importance and it will be useful for the further development of high-efficiency gas turbines and aviation/auto engines with low NOx emissions. The goal is to obtain the frontier results in the related field and publish them in Combustion and Flame and Proceedings of the Combustion Institute. |
