To investigate the effect of synthetic jet on stator blade’s suction surface axial compressor’s performance and stability, a high-speed subsonic single-stage compressor is numerically simulated in this paper. The results show that there an optimal excitation position. Under position’s excitation, peak efficiency improved, comprehensive stability margin also slightly improved. analysis internal flow field shows improvement mainly due to reduction blockage, which reduces stator’s channel loss...

The blade thickness distribution is an important geometric parameter of a compressor rotor blade. It determines the aerodynamic performance rotor, which should be carefully designed. However, manufacturing inaccuracies cause to deviate from ideal design. These deviations alter flow field near surface, affects rotor. Therefore, it great significance quantitatively investigate effects deviation on performance. In this paper, influence analyzed based transonic and uncertainty quantification...

In our previous work ( Chen , X.-Y. ; Chem. Commun. 2013 49 10977 - 10979 ), we have reported the crystal structure and spin-crossover properties of a compound [Fe(NCS)2(tppm)]·S [1·S, tppm = 4,4',4″,4‴-tetrakis(4-pyridylethen-2-yl)tetraphenylmethane, S 5CH3OH·2CH2Cl2]. Here, its analogues [Fe(X)2(tppm)]·S [X NCSe(-), NCBH3(-), N(CN)2(-) for compounds 2·S, 3·S, 4·S, respectively] been synthesized characterized by variable-temperature X-ray diffraction magnetic measurements. The analyses 2·S...

Three novel complexes, namely, [CoIII(3,5-DBCat)(3,5-DBSq)(bpe)]·2CH3CN·2H2O (1·S), [CoIII(3,5-DBCat)(3,5-DBSq)(azpy)]·2CH3CN·2H2O (2·S), and [CoII(3,5-DBSq)2(bpb)][CoIII(3,5-DBCat)(3,5-DBSq)(bpb)]0.5·2CH3CN·2H2O (3·S), were synthesized characterized by valence tautomeric (VT) X-ray diffraction magnetic measurements [where 3,5-DBCatH2 = 3,5-di-tert-butyl-catechol, 3,5-DBSqH 3,5-di-tert-butyl-semiquinone, bpe trans-bis(4-pyridyl)ethylene, azpy trans-4,4′-azopyridine, bpb...

Abstract N , N′ ‐Disubstituted bipyridinium (viologen) and ‐monosubstituted compounds are well known for their electron‐transfer (ET) photochromic behavior. Their modification has exclusively focused on the N‐substituents to date. For first time, we have studied behavior when one pyridyl ring of is substituted with a multifunctional azole group, found that two new coordination based ‐methyl‐4‐pyridinium tetrazolate (mptz) zwitterion, [Zn(mptz) 2 Br ] ( 1 ) [Cd 3 Cl 6 n ⋅4 H O ), exhibit...

We report herein that nickel-mediated trifluoromethylation of chlorinated and brominated phenol derivatives ClArOTs BrArOTf gave chloro(bromo)trifluoromethylarenes through the chemoselective cleavage Ar-O bonds. Furthermore, under similar reaction conditions, Ar-Cl Ar-Br bonds ClArOPiv BrArOTs was achieved to give trifluoromethylated derivatives.

A 3D 2-fold interpenetrated porous coordination polymer, [Fe(NCS)2(tppm)]·5CH3OH·2CH2Cl2 (1·sol, tppm = 4,4′,4′′,4′′′-tetrakis(4-pyridylethen-2-yl)tetraphenylmethane), was synthesized, which showed temperature, light and solvent-induced spin-crossover behaviours.

The reaction of ligand pyrene Q–Q , Co 2 (CO) 8 and Me n tpa gave rise to a series dinuclear cobalt–tetraoxolene compounds formulated as {[Co(Me tpa)] (pyrene Sq–Sq )}[Co(CO) 4 ] · S (Sq = semiquinone; 0, 2C 6 H 5 CH 3 for 3; 1 4; 2, 2CHCl 5).

Due to the high Reynolds numbers together with complex turbulent motions in turbomachinery, selecting a proper turbulence-modeling method is of vital significance interpreting real flow physics. In this paper, shear stress transport (SST) as Reynolds-averaged Navier–Stokes model and scale-adaptive simulation (SAS) zonal large eddy (ZLES) two scale-resolving approaches were chosen simulate low-speed axial compressor rotor at three different blade tip clearances (1.3, 2.6, 4.3% chord length)....

Abstract Rotating instability (RI) can be regarded as a pre-stall signal because such phenomena are usually detected when compressor operates at near-stall point. Since RI is closely relevant to aerodynamic, acoustic, and structural issues, its mechanism has attracted industrial concerns in-depth analysis. In this paper, low-speed axial single rotor row selected the baseline research object. A circumferential casing groove mounted over shroud. The solid treated configurations were simulated...

Abstract In axial compressors, an unsteady flow phenomenon associated with fluctuating tip leakage can be observed at stable operating points high aerodynamic loading close to stall, named rotating instability (RI). Within the frequency spectrum, e.g., from wall pressure measurements, RI is visualized as a hump lower than blade passing frequency. Since indicates increase in noise level and might cause vibration other undesirable structural issues, it has been hot-spot topic turbomachinery...

Lanthanide(III) ion (Ln(III)) sensing has become a major research area owing to its intriguing prospect in clinic, biology, and environmental studies. However, the existing methods have limitations like requirement of expensive instrumentation, long analytical times, sample pretreatments, revealing necessity other methods. In this work, by using N-methyl-4-pyridinium tetrazolate (mptz) zwitterion as an electron acceptor, we obtained several new Ln(III) compounds with electron-transfer (ET)...

In this work, (1-x)Li2TiO3-xLi4NbO4F ceramics were prepared by the conventional solid-state ceramic route. With increase of Li4NbO4F content, phase structure transformed from ordered monoclinic to disordered cubic. By increasing Li3NbO4F temperature coefficient resonant frequency (τf) was successfully adjusted closer zero, while dielectric constant (εr) and microwave quality factor (Qf) decreased some degree. Outstanding properties with a εr = 18.7, Qf 61,388 GHz (6.264 GHz), τf 0.9 ppm/°C...

This letter investigates joint beamforming and antenna selection (JBAS) for a spatial diversity multiple-input multiple-output system, where the transmitter equipped with multiple antennas performs both optimization to maximize received signal-to-noise ratio (SNR). The JBAS problem is NP-hard solve due sparsity constraint. In this letter, we propose smooth approximation-based iterative algorithms address problem. simulation results validate effectiveness of proposed in terms achieved SNR...

An innovative structure of longitudinal grooves was designed on the volute casing a centrifugal pump to improve performance and internal flow characteristics. Comparisons were made between model with grooved (GVC) original (OVC) operating in different working conditions. To get better understanding influence pump, some preliminary studies performed simplified model. The results indicated that application GVC offers under large rate, also can stabilize range pump. In addition, drag reduction...