峰丞 asked in 汽車與交通航空器 · 2 decades ago

如何測得飛機噴射飛動機的排出溫度?????????????

如何測得飛機噴射飛動機的排出溫度?????????????請以專業知識回答

Update:

如何讓機長能第一時間知道機噴射飛動機的排出溫度????

Update 2:

那個測溫度的東西是什麼名稱,是用什麼物質做的,請加以說明???

2 Answers

Rating
  • Anonymous
    2 decades ago
    Favorite Answer

    發動機前後段會有溫度計感應器, 會把發動機前後進氣排氣的溫度差量測出來顯示給飛行員看, 這個數據叫做 EGT, "EXHAUST GAS" Temperature, 由這個數據可以知道發動機運作正不正常, 例如提早知悉發動機起火等等不正常狀況.

    溫度測量使用 "熱電偶探針 (Thermocouple)" 感應發動機段前後溫度的變化, 再以電的訊號類比地傳送到指示器顯示出溫度的讀數.

    熱電偶是什麼物質做的, 隨著熱探針要被使用在什麼環境之下而有所不同, 有可能是白金, 或者是鎢合金, 鎳合金等等.

    各種發動機會放置電熱偶的地點不同: 請參考

    There is contradictory opinion and advice about the best place to install the temperature reading device (thermocouple) that supports the pyrometer, but there is no disagreement that watching EGTs with a graduated gauge is a good thing to do.

    Some publications dealing with EGT temps favor Turbocharger Inlet Temp (TIT) and not Turbocharger Outlet Temp (TOT). This suggests that the thermocouple should be mounted Pre-Turbo (in the exhaust manifold) and not Post-turbo. (in the down pipe) In their view, if you choose to mount the thermocouple in the down pipe, EGT readings will be inaccurate. With the thermocouple in the down pipe, the gauge reacts more slowly and is reading the TOT which is lower than the actual temp of the turbocharger. The difference between TIT and TOT can be as little as 50 degrees F to as much as 400 degrees F under a heavy load.

    Other experts point out that installing the thermocouple in the exhaust manifold, ahead of the turbo, raises the possibility of the thermocouple breaking loose in the heated air stream and damaging the turbo. With greater accuracy goes greater risk.

    One expert gauge manufacturer suggests that mounting the thermocouple in the downpipe and watching for a sustained temperature of 1050 F, is just as good as mounting in the pre-turbo position. Logic would suggest that if the temperature can vary as much as 400 degrees from the input to output side, then the sustained TOT temperature to be watched for under extreme load should be more like 870 F (1270F "straightening" point minus the possible 400 F variation.)

    2005-09-12 09:51:02 補充:

    我的航空專業證照有七張, 不過這些資料其實網路上都找的到, 我只是孤狗了一下再加上我腦袋裏面的東西再幫您翻譯綜合整理而已.

    Source(s): EGT 表來這裡看圖片 http://www.geocities.com/spencerhut/talon/EGT_Gaug...
  • 2 decades ago

    EGT 並不是指示排氣尾管的溫度哦!!!!!!

    它是指示HPT-LPT,,,,,也就是說指示高壓渦輪和低壓渦輪間的溫度!

    如果是雙軸發動機TURBO FAN ENGINE

    單軸 ENGINE安裝在護燄器那 JET ENGINE也就是渦輪出口處

    熱電偶探針安裝在那裡,

    引擎結構大概分為:

    進氣道------風扇葉片----壓縮器---燃燒室--渦輪---後燃器--尾管

    大多的引擎例如

    渦輪扇引擎大部份客機用

    噴射引擎大部份戰鬥機用JET ENGINE

    渦輪螺旋槳引擎

    輻流式引擎

    輔助動力系統APU

    大部份安裝在""""""""""""渦輪"""""""""""""""""""出口

    起動和MAX POWER,APPROCH IDLE, FLIGHT IDLE ,每個情況的尾溫最高限制不同,但是儀表會告訴你,有INDICATION BAR,而且電腦還會紀錄,駕駛艙還有警告聲.

    正常是白色

    超溫是紅色

    熱電偶原理:

    利用兩種不同金屬的熱澎漲係數,所產生的電位差,傳遞訊號引擎控制電腦再到儀表.

    2005-09-13 06:08:53 補充:

    發動機前面的溫度不是拿來和後方做溫度比較的,而是拿來防冰用的!

    事實上只有後方的排氣溫度指示!

    英文打的多,網路上抄錄下來也能成為最佳答案.

    昏倒

    CAA的考試委員的陷阱,就在於EGT不是指示排氣噴口的溫,度那是外行的說法,

    都幫你翻成中文了

    不是進氣溫度和排氣溫度的前後比

    它只有放在一個位置

    真是積非成是

    2005-09-13 06:28:33 補充:

    決對決對不是所謂

    "差量"

    也就是進氣口溫度和排氣口的溫度比!

    決對不是

    你這樣像上面那位仁兄的答案!考CAA執照時會被教官踢出去!

    你不相信問問維修飛機的工程師吧!

    Source(s): CAA FAA交通部民航局維修人員執照考題!
Still have questions? Get your answers by asking now.