公开(公告)号：US5243759A

公开(公告)日：1993-09-14

申请号：US772296

申请日：1991-10-07

Applicant: Wesley D. Brown ,  Kenneth B. Hall ,  Robert J. Kildea

Inventor： Wesley D. Brown ,  Kenneth B. Hall ,  Robert J. Kildea

IPC: B22C9/10 ,  B23P13/00 ,  B23P15/02 ,  F01D5/18

CPC classification number: B22C9/10 ,  B23P13/00 ,  B23P15/02 ,  F01D5/187 ,  F05D2260/202 ,  F05D2260/2212 ,  Y02T50/676 ,  Y10T29/49336 ,  Y10T29/49341 ,  Y10T29/49776

Abstract: The flow rate of the cooling air at the trailing edge of the airfoil of a turbine blade for a gas turbine engine is established by casting the blade to include judiciously located radially spaced projections adjacent to or in the ribs in the trailing edge which serve to meter the flow in the channels formed between the ribs. The holes for forming the projections in the core that are used to form the internal cooling passages in the trailing edge are intentionally undersized. After the core is cleaned and flashed, the blade is cast in a mold and the ceramic core is leached out. The internal cooling passages in the trailing edge are flow tested to obtain the flow rate and pressure and this data is used to resize the projection. Resizing the projection is made by reforming the core with the same die, and with the information previously obtained in the flow test, the holes that form the projections are enlarged by drilling to obtain the desired flow rate. This process is repeated until the desired flow rate for each trailing edge channel is achieved. The die may be changed at this juncture to provide the ultimate dimensioned hole in the core to provide the necessary metering of the cooling air to attain the predetermined flow rate.

Abstract translation: 用于燃气涡轮发动机的涡轮机叶片的翼缘的后缘处的冷却空气的流速通过铸造刀片来建立，该刀片包括与用于计量的后缘相邻或位于后缘的肋中的明显位于的径向间隔的突出部 在肋之间形成的通道中的流动。 用于在芯中形成用于在后缘形成内部冷却通道的突起的孔有意地小型化。 在芯体被清洗和闪光之后，将刀片浇铸在模具中，并将陶瓷芯浸出。 后缘中的内部冷却通道被流动测试以获得流量和压力，并且该数据用于调整投影尺寸。 通过使用相同的模具对芯体进行重新调整大小，并且利用流动测试中先前获得的信息，通过钻孔来扩大形成突起的孔以获得期望的流量。 重复该过程，直到实现每个后缘通道的期望流量。 此时可以改变模具，以在芯体中提供极限尺寸的孔，以提供冷却空气的必要计量以达到预定流量。