Exploring calculation of thermodynamic performance of TFE (turbofan engine) with PDCs (pulse detonation combustors) in BD (bypass duct)

In the introduction of the full paper, we point out what we believe to be the need for developing a suitable method of the calculation of the thermodynamic performance of TFE with PDCs in BD.12 PDCs with the inner diameter of 68 mm are assembled in the bypass duct of a traditional TFE as duct heater. There are two ways of exhaust: separate exhaust (SE) and mixed exhaust (ME). Section 2 presents the method of calculation we explored; although much of the mathematics looks familiar, the way of applying them in the TFE with PDCs is quite differenet from that of applying them in the traditional TFE; in particular, eq. (12) is the new result of our exploration. The calculated results, presented in Figs. 5 and 6, and their analysis indicate preliminarily that: (1) at the design point, compared with SE TFE, the specific thrust (Fs) of SE TFE with PDCs in BD (PS model) improves by 127.6%; (2) the Fs of ME TFE with PDCs in BD (PM model) improves by 74.6%; (3) the specific fuel consumption (sfc) is smaller than that of traditional TFE with afterburner; (4) at a certain flight altitude, the Fs of TFEs with PDCs in BD increases and their sfc decreases with increasing flight Mach number; (5) at the constant flight Mach number, with increasing flight altitude, the Fs of PS model decreases and its sfc increases; (6) the Fs of PM model increases tardily and its sfc decreases tardily; (7) the PS model displays obvious performance gain both at lower flight Mach number and at lower flight altitude; (8) the PM model can work in wider range of flight Mach number and altitude; it has potential and steady performance.