3 research outputs found
パルスデトネーション・エンジン連続作動特性の研究
Get PDFA Pulse detonation engine (PDE) is an internal combustion engine that generates power due to intermittent detonations. As an air supply method, many researchers used the solenoid valves. However, it is unsuitable for air breathing engines which use air from the atmosphere. Then, for practical use there, the PDE is expected to be equipped with some kind of rotary valves which can induce air intermittently from the atmosphere. Although some researchers reported the results using such valves for the PDE, a detailed study of the continuous operation PDE has not been reported yet, so it is meaningful to examine the behavior and the optimization of the PDE with the rotary valve. For this object, it is experimented to prove a certain, continuous operation of 40Hz by this device. The combustion test was performed for 30, 35, and 40Hz operations. The performance was evaluated by two parameters, i.e., thrust F [N] and impulse per unit area Icycle [Ns/m2]. As a result, a 120 cycle, 3 seconds operation was able to be achieved by 40Hz. The impulse was decreased as the operation frequency increased, although the thrust was slightly increased.textapplication/pdfdepartmental bulletin pape
Measurement of azimuthal asymmetries in inclusive production of hadron pairs in e^＋e^－ annihilation at √s = 10.58 GeV
Get PDFThe Collins effect connects transverse quark spin with a measurable azimuthal asymmetry in the yield of hadronic fragments around the quark’s momentum vector. Using two different reconstruction methods we measure statistically significant azimuthal asymmetries for charged pion pairs in e^+e^- annihilation at center-of-mass energies of 10.52 GeV and 10.58 GeV, which can be attributed to the fragmentation of primordial quarks with transverse spin components. The measurement was performed using a data set of 547 fb^{-1} collected by the Belle detector at KEKB improving the statistics of the previously published results by nearly a factor of 20.journal articl
