Tham khảo tài liệu 'study on the propagation of inlet flow distortion in axial compressor using an integral method_3', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Results and Discussion 21 Fig. . The asymptotic behavior of mass flow rate flow rate. Besides a higher mass flow rate will arrive at a larger asymptote. This proportional relation between mass flow rate and inlet distorted velocity can also be seen from Fig. . In conclusion a smaller inlet distorted velocity and larger flow angle may result in a low overall mass flow rate even a back flow Fig. . Fig. . The effects of degree of the initial distortion and the inlet flow angles on the mass flow rate 22 Chapter 1 Study on the Propagation of Inlet Flow Distortion Critical Distortion Line The results in previous paper 8 case 1 case 2 and case 4 expressed the distortion propagation with respect to different inlet flow angle and different inlet distorted velocity. These results are isolated and incomplete. A more suitable analysis way is combining the two parameters inlet flow angle and inlet distorted velocity into a single figure to form a curve as shown in Fig. . We term the curve with Nệ ệx L -ệx 0 0 as critical distortion line . Above the critical distortion line Nệ ệx L - ệx 0 0 the distorted region will grow downstream and become unstable. On the contrary below the critical distortion line Nệ ệx L - ệx 0 0 the distorted region will reduce downstream and become stable. This critical distortion line is a more complete expression for inlet distortion propagation. The six numbering circles in Fig. correspond to all results in case 1 case 2 and case 4 of Table and their results are listed in Table . It is very worthy to note that with different size of distortion region the compressor performs with only one critical distortion line. In other words the size of distortion region has no influence on the critical distortion line. Therefore the proposed critical distortion line includes the principal effects at inlet. Table The corresponding relation between the numbering circles in Fig. and cases calculated in previous .
