Characteristics of transonic flow over an airfoil are determined by a shock wave standing on the suction surface. In this case, the shock wave/boundary layer interaction becomes complex because an adverse pressure gradient is imposed by the shock wave on the boundary layer. Several types of passive control techniques have been applied to shock wave/boundary layer interaction in the transonic flow. Furthermore, possibilities for the control of flow fields due to non-equilibrium condensation have been shown so far, and in this flow field, non-equilibrium condensation occurs across the passage of the nozzle and it causes the total pressure loss in the flow field. However, local occurrence of non-equilibrium condensation in the flow field may change the characteristics of total pressure loss compared with that by non-equilibrium condensation across the passage of flow field and there are few for researches of locally occurred non-equilibrium condensation in a transonic flow field. The purpose of this study is to clarify the effect of locally occurred non-equilibrium condensation on the shock strength and total pressure loss on a transonic internal flow field with circular bump. As a result, it was found that shock strength in case with local occurrence of non-equilibrium condensation is reduced compared with that of no condensation. Further, the amount of increase in the total pressure loss in case with local occurrence of non-equilibrium condensation was also reduced compared with that by non-equilibrium condensation across the passage of flow field.

this reagent and were discarded; fractions 4-11, which reacted positively with the F1 reagent were combined and the benzene removed in vacuo. Recrystallization of the crude white crystalline solid, so obtained, from light petroleum (b.p. 80-100") gave 6-acetoxy-4-S-carboxymethylthio-5-hydroxy-1,7-dimethylindole lactone (10) as white needles (53 mg, m.p. 202-204'). The proton magnetic resonance spectrum of this product in CDCI, indicated the presence of two C-CH, groups at z 7.62 and 7.45; an S-CHZgroup at z 6.54; an N-CH, group at z 5.98; the indole P-proton at z 3.64 (J,,, = 3 Hz); and the indole a-proton at z 3.03 (JZe3 = 3 HZ).Anal. Calcd. for C14H13N04S: C, 57.80; H, 4.50; N, 4.81; S, 11.02. Found: C, 57.61; H, 4.36; N, 4.85; S, 10.69. G. N. COHEN. Compt. Rend. 220, 796 (1945 This is the first report on the dehydrogenation-coupling reaction of an o-quinoid compound with a 1,Cdiolefinic compound. The reaction of 4-t-butyl-o-quinone and methyl linoleate has been studied, and the product which has a 1-(2'-hydroxy-4'(or 5')-t-buty1phenoxy)-2,4-pentadienyl structure has been separated and identified.Canadian Journal of Chemistry, 47, 2106Chemistry, 47, (1969 Previously we reported that urushiol quinone reacts with the side chain of a triolefinic component of urushiol (3-(8', 1 1',1 3'-pentadecatrieny1)-catechol) during the laccase-catalyzed oxidation process of Japanese lacquer, giving a coupling product with a phenyl ether linkage and a conjugated triene structure (1). As a further example of this type of reaction, we now describe the formation of a coupling product (1) in the reaction of 4-t-butyl-o-quinone with methyl linoleate at room temperature. R1 = t-butyl attached to 4 or 5 position Rz = (CHZ)7--COOCH3 3 -(CH2)4--CH3 andlorConcerning the reactions of o-quinones with unsaturated hydrocarbons, it is known that ahigh potential o-quinone, e.g., tetrachloro-o-quinone, abstracts hydrogen from the latter (2,3). It has been also reported that hydroquinone a-tetralyl ether derivatives were obtained by the reaction between the high potential p-quinone derivatives and tetralin ( 4 3 . In those cases, however, an elevated temperature (4) or a radical initiator (5) was required. Therefore, this is the first report on the dehydrogenation-coupling reaction of an o-quinone with a 1,Cdiene system.The reaction product (1) was separated by thinlayer chromatography (t.1.c.) and identified. The results of the elemental analysis and the molecular weight measurement indicate that the compound is a coupling product between methyl linoleate and 4-t-butyl-o-quinone. The presence of a hydroxyl group and a benzene nucleus is obvious in view of the finding of the infrared (i.r.) absorptions at 3600-3200 cm-', and at 1599 and 1510 cm-I, respectively. The conjugated diene structure was identified by the ultraviolet (u.v.) and i.r. absorptions at 234 mp ( E 27 900) and 991 Can. J. Chem. Downloaded from www.nrcresearchpress.com by 54.244.106.145 on 05/12/18For personal use only.

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