专利名称：涡轮喷嘴的翼面形状的制作方法
技术领域：
本发明涉及燃气涡轮的喷嘴级的翼面，尤其涉及燃气涡轮的第三级喷嘴的翼面。
背景技术：
为了满足设计目标，包括改善总的空气动力学效率和喷嘴的空气动力学与机械负载目标，对于燃气涡轮的热气体通道部分的每一级，都必需满足许多特殊的要求。特别是，为了达到这些目标，涡轮部分的第三级必需满足效率、热负荷，寿命，喉部面积和引导的要求。
发明概述根据本发明的一个优选实施例，提供了燃气涡轮的喷嘴级，最好是第三级喷嘴的增强该燃气涡轮性能的翼面形状。该翼面形状改善在该涡轮的各个叶片组之间的相互作用，提高通过第三级的空气动力学效率和改善第三级叶片的负荷情况。因此，部分地限定围绕该喷嘴级的热气体通道环形部分的每一个第三级喷嘴翼面轮廓，满足提高级的效率以及零件寿命和制造能力的要求。
优选的第三级喷嘴设在喷嘴部分中，每一个喷嘴部分具有内环带和外环带，在它们之间有翼面，翼面在圆周上彼此间隔。在这个优选实施例中，共有16个喷嘴部分，和总共64个翼面，即每一个喷嘴部分有4个翼面。
翼面形状可改善空气动力学效率和第三级喷嘴翼面的空气动力学和机械负载。达到必要的效率和负载要求，因而可改善涡轮性能的该喷嘴翼面轮廓，由唯一的一个点轨迹确定。这些唯一的总轨迹确定名义喷嘴翼面轮廓，并用下面表1的笛卡儿坐标X，Y和Z表示。表1中所示的坐标值的点是相对于涡轮中心线的，并且是沿着翼面长度的各个横截面处的冷的(即室温)喷嘴翼面的。正的X，Y和Z方向在轴向与从后面向着涡轮排气口看的涡轮转子中心线平行，并且在从后面和向外向着该喷嘴的外带看的发动机回转方向的切线方向上。X和Y坐标用距离尺寸(例如，以英寸为单位)给出，并且在每一个Z位置光滑地连接，以形成一个光滑的连续的翼面横截面。Z坐标用0～1的无量纲形式给出。通过将用英寸表示的喷嘴翼面高度尺寸，与表1的无量纲的Z值相乘，可得到喷嘴翼面的翼面形状(即轮廓)。将每一个在X和Y平面内形成的翼面截面光滑地与Z方向的相邻的翼面截面连接，形成完整的喷嘴翼面形状。
因为每一个喷嘴翼面使用中受热，结果由于应力和温度作用，该轮廓改变。因此，为了制造目的，用X，Y和Z坐标给出冷态或室温的轮廓。因为制造的喷嘴翼面可能与由下表给出的名义喷嘴翼面轮廓不同，因此在与沿着名义轮廓的任何表面位置垂直的方向上，包括涂层的与名义轮廓距离正或负的160英寸的距离，确定这个喷嘴翼面的轮廓包络面。翼面形状可承受这种改变，不会损害喷嘴翼面的机械和空气动力学功能。
喷嘴翼面的几何形状可按比例放大或缩小，以便引用至相同的涡轮设计中。因此，下面的表1给出的以英寸表示的名义翼面轮廓的X和Y坐标可以为同一个常数或数值的函数。即以英寸表示的X，Y坐标值可以乘以或除以相同的常数或数值，以形成喷嘴翼面轮廓的按比例放大或缩小的形式，同时保持翼面截面形状。
在根据本发明的一个优选实施例中，提供了一种涡轮喷嘴，它包括具有翼面形状的一个翼面；所述翼面具有基本上按照表1给出的笛卡儿坐标系的X，Y和Z值的名义轮廓，其中，Z值为在0.1～0.9范围内的无量纲值，通过将在所述范围内的表1Z值与用英寸表示的翼面高度相乘，可将Z值转换为用英寸表示的Z距离，其中X和Y值为用英寸表示的距离，当用光滑的连续圆弧连接时，这些X和Y值限定了在所述范围内的每一个距离Z处的翼面轮廓截面，在所述范围内的Z距离处的轮廓截面光滑地互相连接，形成所述的喷嘴翼面形状。
在根据本发明的另一个优选实施例中，提供了一种涡轮喷嘴(22)，它包括具有不涂层的名义翼面轮廓的一个翼面；该翼面基本上按照表1给出的笛卡儿坐标系的X，Y的Z值，其中Z值为在0.1～0.9范围内的无量纲值，通过将在所述范围内的表1Z值与用英寸表示的翼面高度相乘，可将Z值转换为用英寸表示的Z距离，其中，X和Y值为用英寸表示的距离，当用光滑的连续圆弧连接时，这些X和Y限定了在所述范围内的每一个距离Z处的翼面轮廓截面，在所述范围内的Z距离处的轮廓载面光滑地互相连接，形成所述的喷嘴翼面形状。X，Y和Z距离，作为同一个常数或数值的函数，其比例可改变，以形成比例放大或缩小的翼面。
在根据本发明的又一个优选实施例中，提供了一种涡轮，它包括具有多个喷嘴的一个涡轮级，每一个喷嘴包括一个具有翼面形状的翼面，该翼面具有基本上按照表1给出的笛卡儿坐标系的X，Y和Z值的名义轮廓；其特征为，Z值为在0.1～0.9范围内的无量纲值，通过将在所述范围内的表1Z值与用英寸表示的翼面高度相乘，可将Z值转换为用英寸表示的Z距离，其中，X和Y值为用英寸表示的距离，当用光滑的连续圆弧连接时，这些X和Y值限定了在所述范围的每一个距离Z处的翼面轮廓截面，在所述范围内的Z距离处的轮廓截面光滑地互相连接，形成所述的喷嘴翼面形状。
附图简述
图1为通过燃气涡轮的热气体通道的示意图，它表示根据本发明的一个优选实施例的第三级喷嘴的翼面；图2为表示放置在内带和外带之间的、根据本发明的4个翼面的第三级喷嘴部分的透视图；图3为在图1和图2中所示的喷嘴部分的翼面的透视图；图4为从外端，沿着径向向内，向着涡轮中心线看的第三级喷嘴翼面的顶部视图；和图5为在翼面的内端和外端的中间的，并且大致沿着图3的5-5线所取的有代表性的翼面轮廓截面。
发明详述参见附图，图1为表示包括多个涡轮级的涡轮12的一个多级涡轮部分10的一部分。图中表示三个级。例如，第一级包括多个在圆周上彼此间隔的喷嘴14和叶片16。喷嘴在圆周上彼此间隔，并且固定在涡轮轴线周围。叶片16安装在涡轮转子27周围，并且在圆周上彼此间隔7。图中还表示了涡轮12的第二级，它包括多个圆周上彼此间隔的喷嘴18和多个安装在转子上的叶片20。图中还表示了第三级，它包括多个在圆周上彼此间隔的喷嘴22和叶片24。喷嘴和叶片位于由箭头26所示的该涡轮的热气体通道中。
又如图2所示，喷嘴(例如，第三级喷嘴22)相应地形成在环形内圆环和外圆环之间在径向延伸的翼面或叶片。这些翼面或叶片也部分地形成通过涡轮12的热气体通道26。如图2所示，第三个喷嘴级由多个喷嘴部分30组成，该喷嘴部分固定在一起，形成围绕着转子回转轴线的一个喷嘴部分的圆周组。每一个喷嘴部分30都包括一个或多个翼面31，在这个优选实施例中，包括4个翼面31。翼面31由横截面为图3和图4所示的翼面形状34的一个叶片32构成。即喷嘴叶片32径向横截面的轮廓为翼面形状34，其翼面轮廓截面35和图5所示。该叶片32分别在形成内环和外环的内带36和外带38之间延伸。在这个优选实施例中，每一个部分30有4个翼面31，涡轮的第三级共有16个部分30和64个翼面31。
为了确定使导向的热气体流动，在涡轮其他级之中的相互作用和涡轮总效率为最优的第三级喷嘴翼面31的翼面形状34，在空间存在唯一的一个可以满足级的要求和可以制造的点集或点轨迹。这个唯一的点轨迹满足喷嘴负载和级效率的要求，并可通过在空气动力学和喷嘴的机械负荷之间的循环重复来达到，使得该涡轮可以有效、安全和平稳地运转。确定喷嘴翼面轮廓的该轨迹包括在下面的表1中给出的笛卡儿坐标系X，Y和Z中的1300个点的点集。表1中的X和Y坐标值用英寸表示，但当该值可以转换时，也可以用其他尺寸单位表示。表1中的Z值为从0～1的无量纲的值。为了将该Z值转换为以英寸表示的Z距离，将表1中给出的无量纲的Z值与用英寸表示的一个常数(例如，喷嘴翼面的高度)相乘。该翼面高度是从在后缘处的喷嘴翼面根部，向外至翼面顶部测量的。从Z＝0至Z＝1的每一个喷嘴的高度为15.420英寸。该坐标系具有垂直的X，Y和Z轴，而Z轴在与包含X和Y值的平面垂直的平面内延伸。Y轴与涡轮转子中心线平行。
通过确定在与X，Y平面垂直的Z方向上的选择的位置上的X和Y坐标值，可以确定在每一个Z距离处的翼面31的轮廓。利用光滑的连续圆弧，将X和Y值连接起来，则可以确定在每一个距离Z处的每一个轮廓截面。通过将相邻的横截面互相光滑地连接，形成翼面，可以确定距离Z之间的各个表面位置的表面轮廓。表1中的值代表在周围，非工作或非热条件下的翼面轮廓，并且是不涂层翼面的翼面轮廓。如一般在笛卡儿坐标系中使用的那样，通常的符号规则是将正值赋予Z值，而X和Y坐标则赋予正和负值。
从附图和表1可看出，在0.0～1范围内的Z距离和相应的X，Y坐标包括翼面轮廓，该轮廓相应地和部分地位于确定热气体通道的内带和外带表面的径向内侧和外侧。由表1的坐标部分地确定的这种轮廓，作为内带和外带之间的翼面的一部分，是假想的，实际上不存在。通过将无量纲的Z值限制在Z＝0.1～0.9的范围内，由相应的X，Y坐标确定的翼面轮廓形成和确定着内带和外带之间的翼面的主要部分，而不使这些翼面轮廓与内带和外带相交。
表1的值表示至4个十进制位用以确定喷嘴翼面的轮廓。然而，第4个十进制位置不重要，可以四舍五入。在翼面31的实际轮廓中，必需考虑一般的制造公差和涂层。因此，表1给出的轮廓值是名义翼面的。这样，制造的喷嘴翼面31的实际轮廓可以在该翼面表面上的测量点和表1所列的表面的理想位置之间的变化范围内。该设计能耐受这种变化，不会损害机械和空气动力学功能。因此，在下面的表1给出的X和Y值上要添加一般的±制造公差，即包括涂层厚度的±值。因此，在与沿着翼面轮廓任何表面位置垂直的方向上的±0.160英寸的距离，形成这个特定的第三级喷嘴翼面的翼面轮廓包络面。
下面的表1给出了优选的名义轮廓包络面的坐标值。
表1-0.0077 0.137300.03730.099400.03070.209300.06900.281400.13220.232200.17930.298900.14580.425500.10740.353500.08510.165500.30010.713400.32230.497700.18420.497600.22280.569600.22670.36530
0.26140.641500.27440.431600.46780.694800.33880.785300.37050.563700.37760.857100.41900.629400.41640.929000.45531.000700.51690.760000.53341.144200.49431.072500.56640.825000.57261.215800.61630.889600.66660.953900.69071.430400.71741.017900.65121.359000.76861.08140
0.61181.287400.73031.501800.85061.715200.87281.207200.81031.644200.92571.269400.77021.573100.82041.144601.01501.997401.08891.452100.97331.927200.93211.856700.97941.330900.89121.786001.03381.391801.18702.275001.32312.478701.27692.411401.23152.343501.31811.68470
1.14312.206201.14491.511501.09992.136901.20171.570201.05722.067301.25941.627901.37781.740401.43861.794901.50041.848201.75972.046701.51972.739401.56341.900101.82762.091901.68572.919301.46842.675901.62761.950601.62822.861401.41862.611101.69301.999501.57292.80130
1.37032.545302.01333.160602.03962.214401.74582.974601.94213.120502.11302.250201.89692.135101.87393.075702.18772.283302.08733.195101.96762.1760018085 3.026902.26352.313602.32243.261702.34032.341302.65552.426002.24233.245902.41802.366302.48513.273302.16373.22360
2.49652.388702.40353.270802.57572.408602.56663.268902.97812.476002.80523.216102.73572.440902.72713.239902.81642.453602.64743.257702.89732.464903.21592.532303.16473.025602.88133.186703.09733.071603.05872.489103.02743.113803.13852.506602.95543.152403.37332.78050
3.28762.571103.33702.853303.34762.626003.28682.917703.38032.699903.22862.974800.73931.45430.10.78221.53340.10.91261.76940.10.82531.61220.10.86881.69090.10.95681.84770.11.00151.92580.11.04662.00350.10.09050.05350.1-0.0112 0.02060.10.0390-0.0200 0.10.03000.10050.10.07110.18050.10.11230.26040.1
0.15360.34030.10.24450.27500.10.19490.42010.10.19300.20130.10.14160.12750.10.27760.57980.10.31910.65950.10.36070.73930.10.23620.50000.10.50600.64060.10.44400.89860.10.45290.56800.10.48580.97820.10.40230.81890.10.29610.34860.10.40030.49510.10.34810.42200.10.61191.21660.10.66760.85650.10.61330.78490.1
0.52771.05770.10.55940.71290.10.56981.13720.10.72250.92780.10.65421.29590.10.83371.06910.10.69661.37520.10.77780.99860.10.94741.20840.10.89021.13900.11.00521.27720.11.12341 41270.11.06391.34530.11.18391.47930.11.13882.15790.11.18602.23440.11.23402.31040.11.28292.38590.11.33272.46070.11.38372.53480.1
1.72342.95300.11.66172.88770.11.48972.68000.11.54502.75090.11.43592.60790.11.60232.82020.11.92483.13210.11.78783.01580.11.85483.07570.11.99773.18480.12.07353.23300.12.15233.27640.12.23692.30870.12.31882.34580.12.23373.31430.12.31773.34630.12.40383.37220.12.49153.39190.12.48662.41030.12.40202.37970.1
2.57222.43760.12.74632.48230.12.65892.46160.11.09242.08090.11.30761.60970.11.24521.54500.11.37111.67340.11.50151.79710.11.43571.73590.11.63701.91530.11.56861.85700.11.70671.97210.11.92462.13090.11.85052.08000.11.77792.02700.12.07762.22530.12.00042.17940.12.15652.26840.12.58043.40530.12.67003.41230.1
2.75993.41300.12.84963.40730.12.93873.39530.13.02673.37720.13.11333.35300.13.28073.28770.13.36093.24720.13.43873.20210.13.19813.32310.13.51333.15190.12.83452.50010.13.01212.52770.12.92312.51510.13.19062.54940.13.10142.53880.13.27982.56060.13.54282.61790.13.45692.59170.13.36882.57390.13.73832.87950.1
3.58353.09580.13.73732.79050.13.64733.03260.13.69372.71300.13.70192.96120.13.62352.65720.11.42792.60100.21.48502.68150.21.54382.76080.21.60452.83870.21.66742.91490.21.73262.98900.21.80043.06080.21.94463.19560.21.87103.12980.22.02123.25780.22.10113.31580.22.27043.41730.22.35953.45990.22.18423.36910.2
2.45113.49650.22.54513.52680.20.51080.96590.20.42230.78940.20.46650.87770.20.0288-0.0075 0.20.07240.08120.20.0962-0.0562 0.2-0.0147 -0.0961 0.20.26100.19000.20.20310.34700.20.20590.10800.20.15090.02610.20.11590.16980.20.15950.25840.20.0414-0.1382 0.20.33430.61260.20.37820.70100.20.42790.43470.20.24680.43550.2
0.37190.35340.20.29050.52410.20.31640.27170.20.48420.51580.20.59830.67700.20.54100.59660.20.55531.05400.20.60001.14210.20.64491.23000.20.71440.83680.20.69001.31790.20.89301.07310.20.73541.40560.20.83280.99480.20.78111.49310.20.77330.91600.20.87351.66760.20.92031.75460.21.06382.01370.20.96761.84120.2
1.01541.92770.21.01551.22800.20.82711.58050.20.95391.15080.21.14151.38000.21.07811.30440.21.20601.45480.20.65610.75710.21.21352.26930.21.26532.35340.21.11282.09940.21.16272.18460.21.31822.43680.21.37242.51930.21.40591.67340.21.33811.60160.21.27151.52870.21.54541.81320.21.47491.74400.21.76582.01100.2
1.92102.13310.21.84252.07320.21.69071.94680.21.61731.88080.22.00132.19050.22.16772.29670.22.08352.24520.22.25392.34480.22.34202.38940.22.61622.50110.22.52332.46760.22.43192.43040.22.71052.53050.22.64093.55070.22.73813.56810.22.83623.57920.22.93483.58390.22.99962.59410.22.90242.57690.22.80592.55580.2
3.03353.58230.23.29352.63040.23.13193.57450.23.19532.62020.23.09732.60830.23.39182.63970.23.32633.54050.23.42163.51450.23.58842.65900.23.49012.64900.23.22973.56050.23.78332.69000.23.69463.40060.23.68632.67150.23.78033.35160.23.51493.48240.23.87782.71820.23.60603.44430.24.00953.16570.24.04782.81650.2
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1.02262.42581.01.10012.58961.00.87762.09391.01.18122.75151.00.94852.26061.01.47861.47371.00.95850.73281.00.56441.24441.00.86320.57871.00.77070.42301.01.05670.88491.01.36881.32971.01.26181.18351.01.15781.03521.00.0714-1.04751.0-0.0005 -0.85361.00.1671-0.14881.00.2772-0.54461.00.0399-0.67711.00.2056-0.71101.0
0.0812-0.5007 1.00.1372-0.8787 1.0-0.0399 -1.0304 1.00.1236-0.3246 1.00.4298-0.2161 1.00.3519-0.3797 1.01.35473.06951.01.44743.22511.01.54423.37821.01.26602.91161.01.75093.67561.01.86093.81951.01.64543.52841.01.82481.89241.01.70661.75521.01.59121.61561.02.19712.28801.02.07002.15911.01.94592.02711.02.21834.22851.0
2.34624.35681.01.97553.95971.02.09474.09611.03.01493.00281.02.47824.48081.02.87272.89071.02.61414.60051.02.59542.65751.02.46012.53711.02.32732.41401.02.73292.77551.03.19475.03301.02.75394.71561.02.89744.82621.03.04444.93201.03.34835.12901.03.50485.22021.03.66415.30641.03.30773.21601.03.15993.11141.0
3.45843.31651.03.92793.58981.03.76853.50361.03.61203.41241.03.82635.38701.03.99155.46131.04.15985.52821.04.50505.63751.05.12054.00581.04.68115.67981.04.94313.96921.04.76763.92441.04.33115.58701.04.42353.81181.04.25533.74441.04.09013.67021.04.59433.87181.05.29934.03451.05.21885.75451.05.65994.06881.0
4.85905.71371.05.47924.05531.05.03835.73891.05.84084.07631.05.39985.75931.05.58085.75231.05.76085.73261.06.20284.08971.06.02194.08171.06.44775.51311.06.56264.13011.05.93885.69931.06.38334.10461.06.11355.65191.06.28355.58951.06.73944.16911.07.03035.08811.07.19714.44181.06.60545.42411.07.14314.94651.0
7.0688 4.31501.06.7563 5.32401.07.2288 4.78741.06.9108 4.22731.06.8994 5.21311.07.2571 4.61021.0上表所示的翼面几何形状比例可以放大或缩小，以便在其他相似的涡轮设计中使用。因此，表1所示的坐标值的比例可以放大或缩小，使翼面截面形状保持不变。表1中的坐标比例变化的形式可以用由英寸表示的X和Y距离乘以或除以相同的数值来表示。当转换成英寸时，无量纲的Z值保持相同，或与X和Y值的比例变换相同，可与相同或不同的数值相乘。
虽然，已结合目前认为是最实际和优选的实际例说明了本发明，但应当理解，本发明不是仅局限于所述的实施例；相反，在所附权利要求书的精神和范围内，它涵盖各种改进和等同的改变。
零件清单多级涡轮截面10涡轮12喷嘴14，18，22叶片16，20，24涡轮转子27箭头26喷嘴部分30翼面31叶片32翼面形状34翼面轮廓截面35内带36外带38
权利要求
1.一种涡轮喷嘴(22)，它包括一个具有翼面形状(34)的翼面(31)；所述翼面具有基本上按照表1所给出的笛卡儿坐标系的X，Y和Z值的名义轮廓，其中，Z值为在0.1～0.9范围内的无量纲值，通过将在所述范围内的表1Z值与用英寸表示的翼面高度相乘，可将Z值转换为用英寸表示的Z距离，其中，X和Y值为用英寸表示的距离，当用光滑的连续圆弧连接时，这些X和Y值限定了在其所述范围内的每一个距离Z处的翼面轮廓截面(35)，在所述范围内的Z距离处的轮廓截面光滑地互相连接，形成所述的喷嘴翼面形状。
2.如权利要求1所述的涡轮喷嘴，其特征为，它形成涡轮的第三级的一部分。
3.如权利要求1所述的涡轮喷嘴，其特征为，在后缘处的翼面(31)的根部半径为29.255英寸，沿着后缘的高质为15.420英寸，所述喷嘴构成涡轮第三级的一部分。
4.如权利要求1所述的涡轮喷嘴，其特征为，所述翼面形状(34)处在与任何翼面表面位置垂直的方向上的±0.160英寸内的一个包络面内。
5.一种涡轮喷嘴(22)，它包括具有不涂层的名义翼面轮廓的翼面(31)；该翼面基本上按照表1给出的笛卡儿坐标系的X，Y和Z值，其中，Z值为在0.1～0.9范围内的无量纲值，通过将在所述范围内的表1Z值与用英寸表示的翼面高度相乘，可将Z值转换为用英寸表示的Z距离，其中，X和Y值为用英寸表示的距离，当用光滑的连续圆弧连接时，这些X和Y值限定了在其所述范围内的每一个距离Z处的翼面轮廓截面(35)，在所述范围内的Z距离处的轮廓截面光滑地互相连接，形成所过的喷嘴翼面形状。X，Y和Z距离，作为同一个常数或数值的函数，其比例可改变，以形成比例放大或缩小的翼面。
6.如权利要求5所述的涡轮喷嘴，其特征为，它形成涡轮第三级的一部分。
7.如权利要求4所述的涡轮喷嘴，其特征为，在其后缘，该翼面(31)的根部半径为29.255英寸，沿着该后缘的高度为15.420英寸，所述喷嘴构成涡轮的第三级的一部分。
8.一种涡轮，它包括具有多个喷嘴(22)的一个涡轮级，每一个所述喷嘴包括具有翼面形状(34)的一个翼面(31)，所述翼面具有基本上按照表1给出的笛卡儿坐标系的X，Y和Z值的名义轮廓；其中，Z值为在0.1～0.9范围内的无量纲值，通过将在所述范围内的表1Z值与用英寸表示的翼面高度相乘，可将Z值转换为用英寸表示的Z距离，其中，X和Y值为用英寸表示的距离，当用光滑的连续圆弧连接时，这些X和Y值限定了所述范围内的每一个距离Z处的翼面轮廓截面(35)，在所述范围内的Z距离处的轮廓截面光滑地互相连接，形成所述的喷嘴翼面形状。
9.如权利要求8所述的涡轮，其特征为，该涡轮的喷嘴构成该涡轮的第三级的一部分。
10.如权利要求8所述的涡轮，其特征为，该涡轮级具有64个翼面(31)，并且，坐标值Y与该涡轮的回转轴线平行延伸。
全文摘要
第三级喷嘴(22)具有基本上按照表1所示的笛卡儿坐标值X，Y和Z的翼面轮廓，其中，X和Y值用英寸表示，并确定在每一个距离Z处的翼面轮廓截面(35)。Z为在0.1～0.9范围内的无量纲值，通过将表1在所述范围内的Z值，与用英寸表示的翼面高度相乘，可将Z值转换为用英寸表示的Z距离。Z距离处的轮廓截面彼此光滑地连接，形成该喷嘴的翼面形状。该X和Y距可以比例放大或缩小，形成一个比例放大或缩小的喷嘴翼面。由X，Y和Z距离给出的名义翼面在±0.160英寸的包络面内。
文档编号F01D5/14GK1580500SQ200410058759
公开日2005年2月16日 申请日期2004年7月30日 优先权日2003年7月31日
发明者B·P·阿内斯, R·R·拜, G·L·西登, P·克里施纳库马, B·L·史密斯, P·C·塞伦特 申请人:通用电气公司