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555

FM2006.008 (2008)

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558

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559

https://doi.org/10.1016/j.proci.2016.06.090

560

561

34

A. Kawasaki and J. Kasahara, A novel characteristic length of detonation relevant to supercritical diffraction,

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562

563

564

565

566

567

568

569

Table 1

570

velocities and stability parameters were calculated using the NASA CEA code [31, 32] and

571

ZND code [34] with GRI-Mech 3.0 [35], respectively, at p0 = 50 kPa and T0 = 293 K.

Experimental conditions and typical mixture characteristics. CJ detonation

yAr

[%]

lc

[mm]

DCJ

[m/s]

Cell data

10, 20

2340

26

Eq. 2

[10, 38, 39]

E2

50

10

1940

9.7

Eq. 3

[38, 40]

E3

67

10

1800

6.3

Eq. 4

E4

75

10

1720

4.9

Eq. 5

[38]

10

2390

28

Eq. 6

[16, 41–48]

80

10

1690

5.9

Eq. 7

[16, 48]

Mixture

E1

A1

A2

C2H4 + 3O2 / Ar

2C2H2 + 5O2 / Ar

572

573

35

A. Kawasaki and J. Kasahara, A novel characteristic length of detonation relevant to supercritical diffraction,

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574

575

576

577

578

579

580

Fig. 1. Schematic of observation chamber.

581

582

36

A. Kawasaki and J. Kasahara, A novel characteristic length of detonation relevant to supercritical diffraction,

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583

584

585

586

587

588

Fig. 2. Typical sequences of single detonation diffraction processes for C2H4 + 3O2 (E1) and lc = 10 mm. (a)

589

Schlieren photographs for supercritical diffraction, p0 = 30 kPa, T0 = 20 °C, frame interval = 2 s. See also Movie

590

1a, available as supplementary material. (b) Schlieren photographs for subcritical diffraction, p0 = 10 kPa, T0 =

591

20 °C, frame interval = 2 s. See also Movie 1b, available as supplementary material. (c) Illustration of a reflection

592

event of a transverse detonation wave in supercritical diffraction, frame interval = 1 s.

593

594

37

A. Kawasaki and J. Kasahara, A novel characteristic length of detonation relevant to supercritical diffraction,

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595

596

597

598

599

600

601

Fig. 3. Reflection point distance vs. initial pressure for supercritical diffraction in ethylene mixtures (E1–E4).

602

603

38

A. Kawasaki and J. Kasahara, A novel characteristic length of detonation relevant to supercritical diffraction,

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604

605

606

607

608

609

610

Fig. 4. Reflection point distance vs. initial pressure for supercritical diffraction in acetylene mixtures (A1–A2).

611

612

39

A. Kawasaki and J. Kasahara, A novel characteristic length of detonation relevant to supercritical diffraction,

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613

614

615

616

617

618

619

Fig. 5. Reflection point distance vs. initial partial pressure of fuel for supercritical diffraction in ethylene mixtures

620

(E1–E4).

621

40

A. Kawasaki and J. Kasahara, A novel characteristic length of detonation relevant to supercritical diffraction,

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622

623

624

625

626

627

628

Fig. 6. Reflection point distance vs. initial partial pressure of fuel for supercritical diffraction in acetylene mixtures

629

(A1–A2).

630

41

A. Kawasaki and J. Kasahara, A novel characteristic length of detonation relevant to supercritical diffraction,

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631

632

633

634

635

636

637

Fig. 7. Product of reflection point distance and initial pressure vs. argon mole fraction for supercritical diffraction.

638

639

42

A. Kawasaki and J. Kasahara, A novel characteristic length of detonation relevant to supercritical diffraction,

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640

641

642

643

644

645

646

Fig. 8. Ratio of re-evaluated reflection point distance to channel width vs. argon mole fraction in ethylene mixtures

647

(E1–E4). The reflection point distances were re-evaluated by using the fitted curves shown in Fig. 5. For the

648

subcritical diffraction, data points were given by extrapolation.

649

650

43

A. Kawasaki and J. Kasahara, A novel characteristic length of detonation relevant to supercritical diffraction,

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651

652

653

654

655

656

657

Fig. 9. Ratio of re-evaluated reflection point distance to channel width vs. argon mole fraction in acetylene

658

mixtures (A1–A2). The reflection point distances were re-evaluated by using the fitted curves shown in Fig. 6. For

659

the subcritical diffraction, data points were given by extrapolation.

660

661

44

A. Kawasaki and J. Kasahara, A novel characteristic length of detonation relevant to supercritical diffraction,

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662

663

664

665

666

667

668

Fig. 10. Ratio of channel width to cell width vs. argon mole fraction in ethylene mixtures (E1–E4).

669

670

45

A. Kawasaki and J. Kasahara, A novel characteristic length of detonation relevant to supercritical diffraction,

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671

672

673

674

675

676

677

Fig. 11. Ratio of channel width to cell width vs. argon mole fraction in acetylene mixtures (A1–A2).

678

679

46

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